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Making Comparisons
比較級: -er と more

1 物事を比較する（より大きい、より高価な） 2 比較級: -er と more 3 不規則な比較級: better, worse, more 4 同等の比較 (as...as) 5 最上級：最高と最悪 (-est / most) 6 不規則な最上級：最高、最悪など

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A2 Adjectives & Adverbs 11 min read かんたん

比較級: -er と more

「-er」と「more」を使いこなして、英語で自然に、そして上手に何でも比べられるようになろう！

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Grammar Rule in 30 Seconds

Use '-er' for short words and 'more' for long words to compare two things using 'than'.

Add '-er' to one-syllable adjectives like 'fast' to get 'faster'.
Change '-y' to '-ier' for two-syllable words like 'happy' to get 'happier'.
Use 'more' before adjectives with two or more syllables like 'more expensive'.

🍎 + [Adj + er / more + Adj] + than + 🍏

Overview

### Overview

言語において、物事を比較することは、思考やコミュニケーションの基本的な機能です。英語で、ある人、物、または行動が、他のものよりも特定の性質をより強く持っていることを示したい場合、比較級を使います。この文法規則では、これらの比較級を構築する2つの主な方法、つまり短い形容詞や副詞には接尾辞 -er を付け、長いものには more を付けることに焦点を当てます。この区別をマスターすることは、A2レベルの学習者が好みを示し、違いを説明し、日常英語でニュアンスのある観察を表現するために不可欠です。

比較級を使うことで、単純な描写を超えて、より洗練された会話に参加できるようになります。2つの別々の対象についての事実を述べるだけでなく、それらの間の直接的な比較関係を確立し、どちらがその特性をより高い程度で持っているかを強調することができます。この能力は効果的なコミュニケーションに不可欠であり、一方の選択肢がもう一方よりも好ましい理由や、2つのものがどのように異なるかを明確に述べることができます。

### How This Grammar Works

比較級は、2つの主語または行動を直接比較する際に、その意味の強度を増すために、形容詞または副詞を修飾することによって機能します。例えば、ある本が interesting（興味深い）と描写されている場合、比較級を使うと、別の本が more interesting（より興味深い）であると述べることができ、その性質のレベルが高いことを示します。この文法構造は、共有された属性に基づいて、2つの異なるエンティティ間の不平等の関係を本質的に確立します。

決定的なのは、直接比較を行う際には、比較級の後に必ず than という単語を使用しなければならないということです。Than は、比較の最初の要素と2番目の要素を結びつける、重要な文法的な接続詞として機能します。Than がないと、比較は不完全または曖昧なままになり、聞き手や読み手は何が比較されているのか不確かになります。構造を考えてみましょう：名詞1 + 動詞 + 比較級形容詞/副詞 + than + 名詞2。例えば、My new phone is faster than my old one（私の新しい電話は古いものより速いです）という文では、faster が比較級形容詞であり、than が my new phone を my old one につないでいます。同様に、She learns more quickly than he does（彼女は彼よりも速く学びます）は、比較級副詞 more quickly を使って、彼らの学習速度を比較しています。

-er を使うか more を使うかの選択は任意ではありません。それは主に、基本の形容詞または副詞の音節数によって決まります。この言語的パターンは、英語の自然な音韻傾向を反映しており、短い単語には短く統合された形を、長い単語には別々の単語を好む傾向があります。多音節の単語に -er を付けようとすると、発音しにくい厄介な構造（例：beautifuler）になり、英語話者は more beautiful を選んで避けます。この響きの良さ（euphony）への好みは、これらの形成規則の背後にある重要な原則です。

### Formation Pattern

英語の比較級の形成は、主に基本の形容詞または副詞の音節数に基づいた明確な規則に従います。これらのパターンと関連するスペル調整を理解することは、正しい使用のために不可欠です。

1. 1音節の形容詞と副詞： -er を追加

ほとんどの1音節の形容詞や副詞では、単語の末尾に接尾辞 -er を単純に追加することで比較級を形成します。これは短い単語にとって最も簡単で一般的なパターンであり、簡潔さと発音のしやすさを維持します。

| 基本形 | 比較級 | 例文 |

| :-------- | :-------- | :------------------------------- |

| tall | taller | He is taller than his sister.（彼は妹より背が高いです。） |

| fast | faster | This car runs faster on the highway.（この車は高速道路ではより速く走ります。） |

| old | older | My dog is older than your cat.（私の犬はあなたの猫より年上です。） |

| quick | quicker | Can you type quicker?（もっと速くタイプできますか？） |

| strong | stronger | You look stronger after the gym.（ジムの後、より強く見えます。） |

1音節の単語のスペル規則：

-er を追加する際に、正しい発音と視覚的な一貫性を確保するための特定のスペル調整があります。

単母音 + 単子音で終わる単語（CVCパターン）： 最後の文字を二重にしてから -er を追加します。この規則は、基本単語の短い母音の音を維持するために重要です。子音を二重にしないと、前の母音の音が短母音から長母音に変わる可能性があります（例：bit vs bite）。

| 基本形 | 比較級 | 例文 |

| :-------- | :-------- | :-------------------------------- |

| big | bigger | My house is bigger than yours.（私の家はあなたの家より大きいです。） |

| hot | hotter | Today is much hotter than yesterday.（今日は昨日よりずっと暑いです。） |

| thin | thinner | He looks thinner after his illness.（彼は病気の後に痩せて見えます。） |

| sad | sadder | She seems sadder today.（彼女は今日、より悲しそうです。） |

| wet | wetter | The ground is wetter here.（地面はここではより濡れています。） |

-e で終わる単語： 単純に -r を追加します。既存の最後の -e は、必要な母音の音を提供しており、追加の e は冗長で文法的に正しくありません。

| 基本形 | 比較級 | 例文 |

| :-------- | :-------- | :-------------------------------- |

| large | larger | Our new office is larger.（私たちの新しいオフィスはより大きいです。） |

| nice | nicer | She's a lot nicer than I thought.（彼女は私が思ったよりずっと感じが良いです。） |

| safe | safer | The new route is safer at night.（新しいルートは夜間の方が安全です。） |

| wide | wider | The path becomes wider after the bridge.（橋を渡ると道はより広くなります。） |

2. -y で終わる2音節の形容詞： -y を -i に変更して -er を追加

末尾が -y の2音節の形容詞の場合、-y を -i に変更してから -er 接尾辞を追加します。この規則は、特に -y が ee の音を出す場合に、一貫した音声パターンを維持し、よりスムーズな発音を促進します。

| 基本形 | 比較級 | 例文 |

| :-------- | :-------- | :------------------------------ |

| happy | happier | You look happier today!（あなたは今日、より幸せそうです！） |

| easy | easier | This test was easier than the last one.（このテストは前のものより簡単でした。） |

| funny | funnier | That comedian is funnier now.（あのコメディアンは今の方が面白いです。） |

| heavy | heavier | My suitcase is heavier than yours.（私のスーツケースはあなたのより重いです。） |

| noisy | noisier | The city gets noisier in the evening.（夕方になると街はより騒がしくなります。） |

3. 長い形容詞と副詞（2音節以上、-y で終わらない）： more を使用

形容詞または副詞が2音節以上で、-y で終わらない場合、比較級は単語の前に more を置くことによって作成されます。この方法は響きの良さを優先しています。そのような単語に -er を付けようとすると、厄介で発音しにくい構造（例：interesting-er、carefullier）になります。英語は自然な話し言葉の流れを維持するために、これらの形を避けます。

| 基本形 | 比較級 | 例文 |

| :-------- | :-------- | :--------------------------------------- |

| beautiful | more beautiful | The sunset was more beautiful today.（今日の夕日はより美しかったです。） |

| expensive | more expensive | This car is more expensive than that one.（この車はあの車より高価です。） |

| difficult | more difficult | Learning a new language is more difficult for some.（新しい言語を学ぶことは、人によってはより困難です。） |

| carefully | more carefully | You should drive more carefully in the rain.（雨の中では、より注意深く運転すべきです。） |

| important | more important | This decision is more important now.（この決定は今、より重要です。） |

| interesting | more interesting | The documentary was more interesting than the movie.（そのドキュメンタリーは映画よりも興味深かったです。） |

2音節の単語に関する注意： 一般的な規則では、-y で終わらない2音節の形容詞には more を使用しますが、これらの単語の一部には -er または more のどちらも取れる場合があります。一般的な例としては、clever (cleverer または more clever)、gentle (gentler または more gentle)、quiet (quieter または more quiet)、simple (simpler または more simple)、narrow (narrower または more narrow) があります。どちらの形も一般的に正しいと見なされますが、-er 形の方がやや伝統的に聞こえるかもしれません。A2レベルの学習者にとっては、主なガイドラインに従う方が一般的に安全で明確です。つまり、-y で終わる2音節の単語には -er を、その他の2音節の単語には more を使用します。習熟度が向上するにつれて、これらの両方の形に自然に遭遇し、理解するようになるでしょう。

不規則な比較級

少数ですが頻繁に使用される形容詞や副詞のグループは、不規則な比較級を持っています。これらの単語は標準的な -er または more のパターンに従わず、記憶する必要があります。これらの単語の不規則性は、その長い歴史と英語での頻繁な使用に由来しており、これは言語進化において、不可欠な単語が規則化に抵抗するという一般的な現象です。これらの形は日常コミュニケーションの基本です。

| 基本形 | 比較級 | 例文 |

| :-------- | :-------- | :-------------------------------- |

| good | better | Her grades are better this semester.（彼女の成績は今学期はより良いです。） |

| bad | worse | The traffic is worse than usual.（交通状況は普段より悪いです。） |

| far | farther | The store is farther than I expected.（店は私が思ったより遠いです。） |

| far | further | I need further information on this topic.（このトピックについて、さらなる情報が必要です。） |

| much | more | He has more experience than I do.（彼は私よりも多くの経験があります。） |

| many | more | There are more people here today.（今日、ここにいる人はより多いです。） |

| little | less | I have less time to finish.（終えるための時間がより少なくなりました。） |

farther は主に物理的な距離を示しますが、further も物理的な距離に言及できますが、抽象的または追加的な概念により一般的に使用されます。A2レベルの学習者にとっては、具体的な距離には farther を、抽象的な概念には further を使用するという区別が実用的です。

### When To Use It

比較級は、2つの異なるエンティティ（2人の人物、2つの物体、2つの場所、2つのアイデア、または2つの行動）を特定の性質または様式に基づいて比較している場合に、特に使用されます。基本的な目的は、これらの2つのアイテム間の程度の差を強調することです。比較級は厳密に2つの項目の比較のためであることを覚えておくことが重要です。3つ以上のエンティティを比較している場合は、最上級（例：the tallest、the most interesting）を使用します。これは別の文法規則で説明されています。

比較級を効果的に活用するための実践的なシナリオをいくつか考えてみましょう。

好みの表現： 2つの選択肢の間で好みを選んだり示したりする場合、比較級を使用すると、好みを明確に述べ、しばしばその理由を伝えることができます。例えば、I find classical music more relaxing than jazz.（クラシック音楽はジャズよりもリラックスできると思います。）または This coffee tastes better than the one we had yesterday.（このコーヒーは昨日飲んだものより美味しいです。）
推奨を行う： 一方の選択肢の利点または欠点を強調することによって、他者を導くことができます。This new laptop is faster and more reliable than the old model.（この新しいラップトップは古いモデルよりも速く、より信頼性があります。）または The bus is cheaper than a taxi for short distances.（短距離では、タクシーよりもバスの方が安いです。）
変化または発展の説明： 比較級は、時間が経つにつれて、異なる条件下で、または異なる状況で、何かがどのように進化したかを説明するのに理想的です。The city center is noisier during the day than at night.（日中の中心街は夜よりも騒がしいです。）または He looks happier now that he changed jobs.（彼は転職したので、今の方が幸せそうです。）
特性の比較： 個人、アイテム、または場所間の属性の違いを詳細に説明し、正確な観察を可能にします。My brother is taller than me, but I am stronger.（私の弟は私より背が高いですが、私はより強いです。）または The north side of the mountain is colder than the south side.（山の北側は南側よりも寒いです。）
意見や評価の提供： 2つの対象を評価する際に、比較級は判断や評価を伝えるのに役立ちます。I think online learning is more convenient than traditional classes.（オンライン学習は従来のクラスよりも便利だと思います。）または That movie was worse than I expected.（あの映画は予想よりも悪かったです。）

比較級を効果的に使用する能力は、詳細な説明、意見共有、およびニュアンスのある比較を行う能力を大幅に向上させます。

### Common Mistakes

日本語話者が英語の比較級を学ぶ際に犯しやすい間違いは、主に日本語の文法構造との違いに起因します。これらの間違いを理解することで、より正確な英語表現が可能になります。

1. than の欠落または誤用

間違い： My car is faster my friend's car. (私の車は友達の車より速いです。)
理由： 日本語では、比較の対象を示すために「〜より」という助詞を使いますが、英語では比較級の後に than を使うことが文法的に必須です。日本語の「〜より」は、英語の than とは異なり、単語の後に直接置かれるわけではありません。英語の than は、比較級と、比較される2番目の要素を明確に結びつける役割を果たします。この接続詞がないと、文が不完全または不明瞭になります。
正しい文： My car is faster than my friend's car.

2. 長い形容詞に -er を付けてしまう

間違い： This book is more interestinger than that one. (この本はあの本より興味深いです。)
理由： 日本語では、形容詞の形を変えることは比較的少なく、副詞などを付けて程度を示すことが多いです。英語では、音節数によって -er を付けるか more を付けるかが決まります。interesting のような長い単語（3音節）に -er を付けるのは不自然で、発音しにくいため、英語では避けられます。これは、英語が音節数の多い単語に対して、より簡潔な more を使う傾向があるためです。日本語話者は、単語の長さに応じて接尾辞を付けるという英語の規則に慣れていない場合があります。
正しい文： This book is more interesting than that one.

3. 比較対象が2つであることを意識しない（最上級との混同）

間違い： He is the taller student in the class. (彼はクラスでより背の高い生徒です。)
理由： 日本語では、文脈から比較対象が明らかであれば、明示しないこともよくあります。しかし、英語の比較級は、基本的に2つのものを比較するために使用されます。3つ以上のものを比較する場合は、最上級（the + 形容詞-est または the most + 形容詞）を使用します。この間違いは、比較級と最上級の使い分けの区別が曖昧な場合に起こりやすいです。the taller という形は存在せず、the tallest（最も背が高い）または単に taller（より背が高い、ただし比較対象が暗黙的に2つある場合）となります。
正しい文（クラス全体を比較する場合）： He is the tallest student in the class.
正しい文（2人だけを比較する場合）： He is taller than John.

4. 不規則変化の誤用

間違い： This is gooder than that. (これはあれより良いです。) または I have less books than you. (私はあなたより少ない本を持っています。) (※less は不可算名詞に使うのが一般的)
理由： good の比較級は better、bad は worse、much/many は more、little は less です。これらは規則に従わないため、覚える必要があります。日本語では「良い」が「より良い」になるように、形態変化が少ないか、あるいは「もっと良い」のように助詞や副詞で調整することが多いです。英語の不規則変化は、日本語話者にとって記憶の負担となり、しばしば規則的な形（例：gooder）を誤って適用してしまう原因となります。
正しい文： This is better than that. および I have fewer books than you. (※可算名詞の場合は fewer を使うのがより正確です。)

### Contrast With Similar Patterns

英語には、比較級以外にも、形容詞や副詞の形を変える、またはそれらに関連する単語を使用して、物事の度合いや関係を示す方法があります。ここでは、比較級と、最上級、そして原級（肯定的な形）との違いを明確にしましょう。

| パターン | 用途 | 例 | 日本語でのニュアンス |

| :-------- | :-------- | :-------- | 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-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------### Overview

In English, when you want to express that one thing, person, or action possesses a certain quality to a greater degree than another, you use comparative forms. This grammar rule focuses on the two primary ways to construct these comparatives: adding the suffix -er to shorter adjectives and adverbs, and using the word more before longer ones. Mastering this distinction is crucial for A2 learners to express preferences, describe differences, and make nuanced observations in everyday English.

Comparatives allow you to move beyond simple descriptions and engage in more sophisticated conversations. Instead of just stating facts about two separate items, you can establish a direct comparative relationship between them, highlighting which possesses a characteristic to a greater extent. This ability is essential for effective communication, enabling you to articulate why you prefer one option over another or how two things differ.

### How This Grammar Works

Comparative forms function by modifying an adjective or adverb to express an increased intensity of its meaning when directly contrasting two subjects or actions. For example, if a book is described as interesting, a comparative form allows you to state that another book is more interesting, signifying a higher level of that quality. This grammatical structure inherently establishes a relationship of inequality between two distinct entities based on a shared attribute.

Crucially, when making a direct comparison, you must use the word than after the comparative form. Than acts as a vital grammatical connector, linking the first element of the comparison to the second. Without than, the comparison remains incomplete or ambiguous, leaving the listener or reader uncertain about what is being compared.

Consider the structure: Noun 1 + verb + comparative adjective/adverb + than + Noun 2. For instance, in the sentence My new phone is faster than my old one, faster is the comparative adjective, and than connects my new phone to my old one. Similarly, She learns more quickly than he does uses the comparative adverb more quickly to compare their learning speeds.

The choice between forming a comparative with -er or more is not arbitrary; it is primarily governed by the syllable count of the base adjective or adverb. This linguistic pattern reflects English's natural phonological tendencies, favoring shorter, integrated forms for concise words and separate words for longer, more complex ones. Attempting to add -er to a multi-syllabic word often results in an awkward, difficult-to-pronounce construction (e.g., beautifuler), which English speakers avoid in favor of more beautiful.

This preference for euphony—the quality of being pleasing to the ear—is a key principle behind these formation rules.

### Formation Pattern

Forming comparatives in English follows clear rules primarily based on the number of syllables in the base adjective or adverb. Understanding these patterns and their associated spelling adjustments is essential for correct usage.

1. One-Syllable Adjectives and Adverbs: Add -er

For most adjectives and adverbs containing a single syllable, you form the comparative by simply adding the suffix -er to the end of the word. This is the most straightforward and common pattern for short words, maintaining brevity and ease of pronunciation.

| Base Form | Comparative Form | Example Sentence |

| :-------- | :--------------- | :------------------------------- |

| tall | taller | He is taller than his sister. |

| fast | faster | This car runs faster on the highway. |

| old | older | My dog is older than your cat. |

| quick | quicker | Can you type quicker? |

| strong | stronger | You look stronger after the gym. |

Spelling Rules for One-Syllable Words:

Specific spelling adjustments ensure correct pronunciation and visual consistency when adding -er.

Words ending in a single vowel + single consonant (CVC pattern): Double the final consonant before adding -er. This rule is crucial for preserving the short vowel sound of the base word. Without doubling the consonant, the preceding vowel's sound might change from short to long (e.g., bit vs. bite).

| Base Form | Comparative Form | Example Sentence |

| :-------- | :--------------- | :-------------------------------- |

| big | bigger | My house is bigger than yours. |

| hot | hotter | Today is much hotter than yesterday. |

| thin | thinner | He looks thinner after his illness. |

| sad | sadder | She seems sadder today. |

| wet | wetter | The ground is wetter here. |

Words ending in -e: Simply add -r. The existing final -e already serves to provide the necessary vowel sound, making an additional e redundant and grammatically incorrect.

| Base Form | Comparative Form | Example Sentence |

| :-------- | :--------------- | :-------------------------------- |

| large | larger | Our new office is larger. |

| nice | nicer | She's a lot nicer than I thought. |

| safe | safer | The new route is safer at night. |

| wide | wider | The path becomes wider after the bridge. |

2. Two-Syllable Adjectives Ending in -y: Change -y to -i and add -er

For two-syllable adjectives that end with the letter -y, you change the -y to an -i before adding the -er suffix. This rule maintains a consistent phonetic pattern, particularly when the -y makes an ee sound, and facilitates smoother pronunciation.

| Base Form | Comparative Form | Example Sentence |

| :--------- | :--------------- | :------------------------------ |

| happy | happier | You look happier today! |

| easy | easier | This test was easier than the last one. |

| funny | funnier | That comedian is funnier now. |

| heavy | heavier | My suitcase is heavier than yours. |

| noisy | noisier | The city gets noisier in the evening. |

3. Long Adjectives and Adverbs (Two or More Syllables, Not Ending in -y): Use more

When adjectives or adverbs have two or more syllables and do not end in -y, their comparative form is created by placing the word more directly in front of them. This method prioritizes euphony; attempting to add -er to such words would create awkward and difficult-to-pronounce constructions (e.g., interesting-er, carefullier). English avoids these forms to maintain natural speech flow.

| Base Form | Comparative Form | Example Sentence |

| :----------- | :----------------- | :--------------------------------------- |

| beautiful | more beautiful | The sunset was more beautiful today. |

| expensive | more expensive | This car is more expensive than that one. |

| difficult | more difficult | Learning a new language is more difficult for some. |

| carefully | more carefully | You should drive more carefully in the rain. |

| important | more important | This decision is more important now. |

| interesting| more interesting | The documentary was more interesting than the movie. |

Note on two-syllable words: While the general rule uses more for two-syllable adjectives not ending in -y, a small number of these words can sometimes take either -er or more. Common examples include clever (cleverer or more clever), gentle (gentler or more gentle), quiet (quieter or more quiet), simple (simpler or more simple), and narrow (narrower or more narrow). Both forms are generally considered correct, though the -er form might sound slightly more traditional.

For A2 learners, it is generally safer and clearer to adhere to the primary guideline: -er for two-syllable words ending in -y, and more for other two-syllable words. As your proficiency develops, you will naturally encounter and understand these dual forms.

Irregular Comparatives

A small but frequently used group of adjectives and adverbs possess irregular comparative forms. These words do not follow the standard -er or more patterns and must be memorized. Their irregularity stems from their long history and frequent use in English, a common phenomenon in language evolution where essential words resist regularization.

These forms are fundamental to everyday communication.

| Base Form | Comparative Form | Example Sentence |

| :-------- | :--------------- | :-------------------------------- |

| good | better | Her grades are better this semester. |

| bad | worse | The traffic is worse than usual. |

| far | farther | The store is farther than I expected. |

| far | further | I need further information on this topic. |

| much | more | He has more experience than I do. |

| many | more | There are more people here today. |

| little | less | I have less time to finish. |

While farther primarily denotes physical distance, further can also refer to physical distance but is more commonly used for abstract or additional concepts. For A2 learners, farther for concrete distances and further for abstract notions is a practical distinction.

### When To Use It

Comparatives are specifically employed when you are contrasting two distinct entities—whether they are two people, two objects, two places, two ideas, or two actions—based on a particular quality or manner. The fundamental purpose is to highlight a difference in degree between these two items. It is crucial to remember that comparatives are strictly for two-item comparisons.

If you are comparing three or more entities, you would use a superlative form (e.g., the tallest, the most interesting), which is covered in a separate grammar rule.

Consider these practical scenarios for effectively utilizing comparatives:

Expressing Preferences: When choosing or indicating a favorite between two options, comparatives allow you to clearly state your preference and often the reason. For example, I find classical music more relaxing than jazz. or This coffee tastes better than the one we had yesterday.
Making Recommendations: You can guide others by highlighting the advantages or disadvantages of one option over another. This new laptop is faster and more reliable than the old model. or The bus is cheaper than a taxi for short distances.
Describing Changes or Developments: Comparatives are ideal for illustrating how something has evolved over time, under different conditions, or in different situations. The city center is noisier during the day than at night. or He looks happier now that he changed jobs.
Comparing Characteristics: To detail differences in attributes between individuals, items, or locations, allowing for precise observations. My brother is taller than me, but I am stronger. or The north side of the mountain is colder than the south side.
Giving Opinions and Evaluations: When assessing two subjects, comparatives help you convey your judgment or evaluation. I think online learning is more convenient than traditional classes. or That movie was worse than I expected.

The ability to use comparatives effectively significantly enhances your capacity for detailed description, opinion sharing, and nuanced comparison.

### Common Mistakes

Mistakes that Japanese speakers often make when learning English comparatives are mainly due to differences between Japanese and English grammar structures. Understanding these mistakes will help you express yourself more accurately in English.

1. Omitting or Misusing than

Mistake: My car is faster my friend's car. (My car is faster than my friend's car.)
Reason: In Japanese, you use particles like 「〜より」 (yori) to indicate the object of comparison, but in English, the word than is grammatically essential after the comparative adjective or adverb. Japanese 「〜より」 is not a direct equivalent of English than in terms of its grammatical function or placement. English than serves as a crucial connector, clearly linking the comparative form to the second item being compared. Without this connector, the sentence feels incomplete or unclear.
Correct Sentence: My car is faster than my friend's car.

2. Adding -er to Long Adjectives

Mistake: This book is more interestinger than that one. (This book is more interesting than that one.)
Reason: In Japanese, the modification of adjectives is often done using particles or adverbs rather than changing the adjective's form itself. In English, the choice between -er and more depends on the number of syllables. For long words like interesting (three syllables), adding -er is unnatural and difficult to pronounce in English. English tends to use the more concise more for longer words. Japanese speakers might not be accustomed to the English rule of changing word forms based on length and may incorrectly try to apply the -er ending.
Correct Sentence: This book is more interesting than that one.

3. Not Distinguishing Between Two Items and Three or More (Confusion with Superlatives)

Mistake: He is the taller student in the class. (He is the taller student in the class.)
Reason: In Japanese, the context often makes the scope of comparison clear, even without explicit mention. However, English comparative adjectives are fundamentally used for comparing two things. When comparing three or more items, the superlative form (e.g., the tallest, the most interesting) must be used. This mistake arises when the distinction between comparative and superlative usage is unclear. The phrase the taller is grammatically incorrect; it should be either the tallest (for three or more) or simply taller (if comparing only two people, with the second person implied or stated).
Correct Sentence (comparing within the whole class): He is the tallest student in the class.
Correct Sentence (comparing only two people): He is taller than John.

4. Misusing Irregular Forms

Mistake: This is gooder than that. (This is better than that.) or I have less books than you. (I have fewer books than you.)
Reason: The comparative forms of good (better), bad (worse), much/many (more), and little (less) are irregular and must be memorized. Japanese has fewer morphological changes for such concepts, often using particles or adverbs like 「もっと」 (motto) for

Comparative Formation Rules

Adjective Type	Rule	Example	Comparative
1 Syllable	Add -er	Fast	Faster
1 Syllable (CVC)	Double consonant + -er	Big	Bigger
1 Syllable (ends in -e)	Add -r	Nice	Nicer
2 Syllables (ends in -y)	Change y to i + -er	Happy	Happier
2+ Syllables	Use 'more'	Modern	More modern
Irregular	Total change	Good	Better
Irregular	Total change	Bad	Worse
Irregular	Total change	Far	Farther/Further

Meanings

The comparative form is used to compare differences between the two objects it modifies (larger, smaller, faster, higher). It is used in sentences where two nouns are compared.

Short Adjectives

Adding the suffix '-er' to adjectives with one syllable.

“The sun is hotter than the moon.”

“This box is heavier than that one.”

Long Adjectives

Using the word 'more' before adjectives with two or more syllables.

“This book is more interesting than the movie.”

“She is more intelligent than her classmates.”

Irregular Comparatives

Adjectives that change completely in their comparative form.

“Your score is better than mine.”

“The weather today is worse than yesterday.”

Reference Table

Reference table for 比較級: -er と more
形容詞・副詞の長さ	ルール	例の単語	比較級の形
1音節	-erをつける	Tall	Taller
1音節（-eで終わる）	-rをつける	Large	Larger
1音節（CVCパターン）	子音を重ねて-er	Big	Bigger
2音節（-yで終わる）	yをiに変えて-er	Happy	Happier
2音節以上（-yで終わらない）	前に'more'をつける	Important	More important
副詞（-lyで終わる）	前に'more'をつける	Quickly	More quickly
不規則な形	特別な形を覚える	Good	Better
不規則な形	特別な形を覚える	Bad	Worse

フォーマル度スペクトル

フォーマル

He is taller than I am.

He is taller than I am. (Physical description)

ニュートラル

He is taller than me.

He is taller than me. (Physical description)

カジュアル

He's taller than me.

He's taller than me. (Physical description)

スラング

He's got way more height than me.

He's got way more height than me. (Physical description)

比較級の作り方

比較級の形容詞・副詞

短い単語（1音節）

Tall Taller
Big Bigger
Fast Faster

「-y」で終わる単語（2音節）

Happy Happier
Easy Easier

長い単語（2音節以上、-yで終わらない）

Beautiful More beautiful
Expensive More expensive
Carefully More carefully

不規則な形

Good Better
Bad Worse

「-er」と「More」の使い分け

「-er」をつける

1音節の形容詞・副詞 cold → colder, fast → faster

「-y」で終わる2音節の形容詞 funny → funnier, hungry → hungrier

スペリングルールが適用される big → bigger (子音を重ねる), large → larger (rをつける)

「More」を使う

「-y」で終わらない2音節以上の形容詞 modern → more modern, famous → more famous

ほとんどの副詞（特に「-ly」で終わるもの） quickly → more quickly, carefully → more carefully

元の単語のスペリングは変わらない前に「more」を置くだけ

比較級の形容詞・副詞フローチャート

形容詞・副詞は1音節ですか？

YES

「-er」をつけます（例: fast → faster）

2音節で「-y」で終わりますか？

YES

「-y」を「-i」に変えてから「-er」をつけます（例: happy → happier）

単語の前に「more」をつけます（例: interesting → more interesting）

不規則な単語ですか（good, bad, far）？

YES

特殊な形を使います: better, worse, farther/further

上記の音節ルールに従います

比較級の例（種類別）

📏

「-er」で終わる形

• taller
• smaller
• older
• faster
• nicer
• bigger

😊

「-ier」で終わる形

• happier
• easier
• funnier
• busier
• prettier
• heavier

➕

More + 形容詞・副詞

• more beautiful
• more expensive
• more important
• more carefully
• more modern
• more quickly

🌟

不規則な形

• better
• worse
• farther
• further

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レベル別の例文

I am taller than my sister.

A car is faster than a bike.

This apple is bigger.

My cat is smaller than your dog.

This phone is more expensive than that one.

I am happier today than yesterday.

Is London bigger than Paris?

The movie was better than the book.

The city is much noisier than the countryside.

This exercise is slightly easier than the last one.

He is more talented than he realizes.

The new model is significantly more efficient.

The more I study, the more I realize I don't know.

The situation is getting more and more complicated.

She is less interested in sports than her brother is.

The results were far better than we had anticipated.

The proposal was no less controversial than the previous one.

He was rather more upset than he let on.

The implications are far-reaching, more so than initially thought.

The narrowness of the path became even more pronounced.

The newer policy is arguably more robust, yet less flexible.

Her elder sister remains the more formidable of the two.

The discrepancy was all the more apparent given the context.

It was a task more easily described than performed.

間違えやすい

Comparatives: -er and more 対 Comparatives vs. Superlatives

Learners use '-est' when they only have two items.

Comparatives: -er and more 対 Than vs. Then

They sound similar, but 'then' is about time.

Comparatives: -er and more 対 More vs. Very

Learners use 'very' to compare.

よくある間違い

✗

He is more big.

✓

He is bigger.

Short adjectives use '-er', not 'more'.

✗

I am more good.

✓

I am better.

'Good' is irregular.

✗

She is taller that me.

✓

She is taller than me.

Use 'than' for comparison, not 'that'.

✗

It is hoter today.

✓

It is hotter today.

Double the consonant in CVC words.

✗

This is more better.

✓

This is better.

Never use 'more' with an irregular comparative or an '-er' form.

✗

It is more easy.

✓

It is easier.

Two-syllable words ending in -y must use '-ier'.

✗

He is more tall than I.

✓

He is taller than me.

Mixing 'more' with a short adjective.

✗

The movie was more bad.

✓

The movie was worse.

'Bad' is irregular.

✗

He is elder than me.

✓

He is older than me.

'Elder' is usually used as an adjective before a noun, not with 'than'.

✗

This is superior than that.

✓

This is superior to that.

Latin-based comparatives like 'superior' or 'inferior' use 'to', not 'than'.

文型パターン

The ___ is ___er than the ___.

I think ___ is more ___ than ___.

My ___ is better than your ___.

It's getting ___er and ___er.

Real World Usage

Online Shopping constant

This laptop is more powerful but more expensive.

Weather Forecasts very common

Tomorrow will be slightly warmer than today.

Job Interviews common

I believe I am more qualified for this role than other candidates.

Dating Apps common

I'm looking for someone taller than me.

Travel Planning very common

Is the hotel closer to the beach than the airport?

Restaurant Reviews common

The pizza here is better than the one across the street.

Sports Commentary constant

He is running faster than his opponent!

Social Media Captions very common

Happier than ever!

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💡

音節を数えよう！

音節の数が一番のヒントになります。1音節なら「-er」、2音節以上（yで終わらないもの）なら「more」を使うのが基本です。あなたの主要なガイドです！ "It's your primary guide!"

⚠️

二重比較は避けよう！

「more faster」とか「more happier」とは言わないでね。「-er」か「more」のどちらか一つだけを使うのが正しいです。よくある間違いだけど、簡単に直せます！ "It's a common, but easily fixable, mistake!"

🎯

「Than」を使って練習しよう

2つのものを具体的に比較する時は、常に「than」を含めることを覚えておいてください。「My dog is bigger *than* your cat」のように、比較を明確かつ完璧にします。それは接着剤のようなものです！ "It's the glue!"

🌍

カジュアルな「Than」の使い方

とてもカジュアルな話し言葉、特に若者の間では、「bigger *than* me」のように「bigger *than* I do」が簡略化されて使われることがあります。「bigger than I」が文法的には正しいですが、「bigger than me」は非公式な文脈で非常に一般的で受け入れられています。

💡

「y」で終わる単語に注意！

「y」で終わる2音節の形容詞は特別です！「-er」を加える前に「y」を「i」に変えることを覚えておいてください（例: pretty → prettier）。これは重要なスペリングルールです。

Smart Tips

If it ends in -y, -er, -le, or -ow, it usually takes '-er'. If not, 'more' is a safer bet.

more narrow → narrower

Use 'much' or 'way' before the comparative to add emphasis.

It is colder. → It is way colder!

Always use 'than' followed by a subject pronoun and a verb.

He is taller than me. → He is taller than I am.

Check if it's a 'CVC' word. If it is, double that last letter before adding -er.

biger → bigger

発音

/ˈtɔːlər/

The Schwa Suffix

The '-er' ending is almost always pronounced as a weak schwa /ə/ in British English or a rhotic /ər/ in American English. Do not stress it.

Better than /ˈbetər ðən/

Linking 'Than'

The word 'than' is usually reduced to /ðən/. It links quickly to the following word.

Comparison Stress

This one is BIGGER than that one.

We often stress the comparative adjective to emphasize the difference.

暗記しよう

記憶術

Short is Sweet: Add -er. Long is Strong: Use More.

視覚的連想

Imagine a short person standing on a box labeled '-er' to reach a high shelf, while a tall person (long word) just needs a friend named 'More' to help them.

Rhyme

If the word is short and small, add -er to stand tall. If the word is long and wide, put 'more' right by its side.

Story

Once there was a small cat named 'Fast' who wanted to be 'Faster', so he ate an '-er' cookie. His friend, a big elephant named 'Intelligent', couldn't fit the cookie, so he just carried a sign that said 'More'.

Word Web

形容詞「big」は1音節なので、「g」を重ねて「-er」をつけます。「More big」は間違いで、「biggest」は最上級です。

文中の間違いを見つけて直しましょう。 Error Correction

Find and fix the mistake:

Learning Spanish is more harder than learning French.

✓ Correct! ✗ Not quite. Correct answer: Learning Spanish is harder than learning French.

「Hard」は1音節の形容詞なので、比較級の形は「harder」です。1音節の形容詞には「more」を使いません。

正しい比較級の形容詞を使っている文を選びましょう。選択問題

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: This book is more interesting than that movie.

「Interesting」は3音節なので、比較級を作るには「more」を前につけます。「-er」をつけたり、「more」と「-er」の両方を使ったりするのは間違いです。

Score: /3

練習問題

8 exercises

Complete the sentence with the correct comparative form of the adjective in brackets.

My house is ___ (big) than yours.

✓ Correct! ✗ Not quite. Correct answer: bigger

'Big' is a one-syllable CVC word, so we double the 'g' and add '-er'.

Choose the correct sentence. 選択問題

Which sentence is grammatically correct?

✓ Correct! ✗ Not quite. Correct answer: better than that one.

'Good' is irregular and becomes 'better'.

Find the mistake in the sentence. Error Correction

Find and fix the mistake:

She is more intelligenter than her brother.

✓ Correct! ✗ Not quite. Correct answer: more intelligenter

You cannot use 'more' and '-er' together. It should be 'more intelligent'.

Rewrite the sentence using 'than'. Sentence Transformation

The blue car is $20,000. The red car is $15,000. (expensive)

✓ Correct! ✗ Not quite. Correct answer: The blue car is more expensive than the red car.

'Expensive' has three syllables, so we use 'more'.

Match the adjective to its comparative form. Match Pairs

Bad, Happy, Far

✓ Correct! ✗ Not quite. Correct answer: Worse, Happier, Farther

These follow the irregular and -y rules.

Complete the sentence.

Learning English is ___ (easy) than learning Chinese.

✓ Correct! ✗ Not quite. Correct answer: easier

Words ending in -y change to -ier.

Select the correct word to complete the comparison. 選択問題

I am taller ___ my father.

✓ Correct! ✗ Not quite. Correct answer: than

'Than' is the correct conjunction for comparisons.

Put the words in the correct order. Sentence Building

today / than / is / it / yesterday / colder

✓ Correct! ✗ Not quite. Correct answer: It is colder today than yesterday.

The standard order is Subject + Verb + Comparative + Than + Object.

Score: /8

Practice Bank

12 exercises

文を完成させる正しい比較級の形を選びましょう。穴埋め問題

The weather today is ___ than yesterday.

✓ Correct! ✗ Not quite. Correct answer: hotter

正しい比較級の形容詞を使っている文を選びましょう。選択問題

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: My new laptop is more expensive than my old one.

文中の間違いを見つけて直しましょう。 Error Correction

She drives more carefullyer than her brother.

✓ Correct! ✗ Not quite. Correct answer: She drives more carefully than her brother.

英語に翻訳しましょう。翻訳

Translate into English: 'El examen fue más fácil de lo que pensaba.'

✓ Correct! ✗ Not quite. Correct answer: ["The exam was easier than I thought.","The test was easier than I thought."]

これらの単語を並べ替えて文を作りましょう。 Sentence Reorder

Arrange these words into a sentence:

✓ Correct! ✗ Not quite. Correct answer: My brother is older than me.

正しい比較級の形で文を完成させましょう。穴埋め問題

This coffee tastes a little ___ than the one I usually drink.

✓ Correct! ✗ Not quite. Correct answer: more bitter

各形容詞を正しい比較級の形と合わせましょう。 Match Pairs

Match the adjectives with their comparative forms:

✓ Correct! ✗ Not quite. Correct answer: matched

英語に翻訳しましょう。翻訳

Translate into English: 'Ella es más paciente que yo.'

✓ Correct! ✗ Not quite. Correct answer: ["She is more patient than I.","She is more patient than me."]

文中の間違いを見つけて直しましょう。 Error Correction

The new software is efficienter than the old one.

✓ Correct! ✗ Not quite. Correct answer: The new software is more efficient than the old one.

これらの単語を並べ替えて文を作りましょう。 Sentence Reorder

Arrange these words into a sentence:

✓ Correct! ✗ Not quite. Correct answer: This exercise is more challenging than that.

正しい比較級の形で文を完成させましょう。穴埋め問題

He responded ___ to my message this time.

✓ Correct! ✗ Not quite. Correct answer: more quickly

正しい比較級の形容詞を使っている文を選びましょう。選択問題

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: My commute is longer than yours.

Score: /12

よくある質問 (8)

No, 'better' is already comparative. Adding 'more' is redundant and incorrect. Just say `better`.

Double the last letter for one-syllable words that end in a single vowel and a single consonant (CVC), like `big` -> `bigger` or `hot` -> `hotter`.

In modern English, they are often used interchangeably. However, `farther` usually refers to physical distance, while `further` refers to metaphorical distance (e.g., 'further information').

Technically, 'fun' is a noun, so 'more fun' is the standard form. While you might hear 'funner' in very casual speech, it is considered incorrect in exams or formal writing.

Both are used. `Than me` is common and natural in conversation. `Than I am` or `than I` is more formal.

Yes, if they don't end in 'y'. For example, `more modern` or `more famous`. If they end in 'y', use `-ier`.

Use the structure `as + adjective + as`. For example, 'I am as tall as my brother.'

The opposite is `less`. For example, 'This book is less interesting than the other one.'

Scaffolded Practice

1

2

3

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

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In Other Languages

Spanish moderate

más + adjective

No suffix equivalent to '-er'.

French moderate

plus + adjective

Uses 'plus' instead of suffixes.

German high

adjective + -er

German uses '-er' for almost all adjectives, even long ones.

Japanese low

yori

No morphological change to the adjective.

Chinese low

bǐ (比)

Comparison is handled by sentence structure, not word forms.

Arabic low

Elative form (af'al)

Internal root modification.

Learning Path

Prerequisites

物事を比較する（より大きい、より高価な）

不規則な比較級: better, worse, more

Continue With

A2 Builds On

同等の比較 (as...as)

### Overview 英語で何かを比較する際には、様々な表現方法があります。例えば、`taller than`（〜より背が高い）や `more expen...

A2 Builds On

不規則な比較級: better, worse, more

### Overview 英語で「～より良い」「～より悪い」「～をもっと」といった比較を表すとき、通常は形容詞や副詞に `-er` をつけた...

A2 Builds On

最上級：最高と最悪 (-est / most)

Overview フィードをスクロールしていて、最新の「一番カッコいい（`coolest`）ガジェット」や「最高に素晴らしい（`most amazi...

C1 Builds On

〜以上に〜ない：否定における同等性

### Overview C1レベルの学習者にとって、洗練された比較表現を使いこなすことは、高度な思考を表現する上で不可欠です。`no mor...

C1 Builds On

優先順位の選択: 'Rather Than'を使う

### Overview 英語学習において、中級から上級（C1レベル）へとステップアップする際、最も重要になるのが「ニュアンスの微調整...

Related Grammar Rules

複合時制における副詞の語順 (Always, Never, Often)

### Overview 頻度を表す副詞、例えば `always`, `never`, `often`, `usually`, `sometimes` といった言葉は、動作がどれくらい...

形容詞を強調する: Very, So, Really, Too

### Overview 英語では、意味のニュアンスを伝えるために、精密な修飾システムが不可欠です。記述の強さを調整するための最も一...

副詞の位置：様態と程度

### Overview 英語学習において、`adverbs`（副詞）の使いこなしは、B2レベルの学習者が中級から上級へとステップアップするため...

視点・態度副詞 (技術的には、率直に言って)

### Overview ビューポイント＆スタンス副詞（Viewpoint & Stance Adverbs）は、話し手が情報の提示角度や自身の態度、判断を伝...

'so' と 'such a' で強調する

### Overview 英語学習において、中級（B1）から上級（B2）へとステップアップする際に欠かせないのが、自分の感情や状況の「程...

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比較級: -er と more

Grammar Rule in 30 Seconds

Overview

Comparative Formation Rules

Meanings

Short Adjectives

Long Adjectives

Irregular Comparatives

Reference Table

フォーマル度スペクトル

比較級の作り方

短い単語（1音節）

「-y」で終わる単語（2音節）

長い単語（2音節以上、-yで終わらない）

不規則な形

「-er」と「More」の使い分け

比較級の形容詞・副詞フローチャート

比較級の例（種類別）

「-er」で終わる形

「-ier」で終わる形

More + 形容詞・副詞

不規則な形

レベル別の例文

間違えやすい

よくある間違い

文型パターン

Real World Usage

音節を数えよう！

二重比較は避けよう！

「Than」を使って練習しよう

カジュアルな「Than」の使い方

「y」で終わる単語に注意！

Smart Tips

発音

暗記しよう

記憶術

視覚的連想

Rhyme

Story

Word Web

チャレンジ

文化メモ

知ってた？

会話のきっかけ

日記のテーマ

よくある間違い

Test Yourself

練習問題

Practice Bank

よくある質問 (8)

Scaffolded Practice

1

2

3

4

Mastery Progress

In Other Languages

Learning Path

Prerequisites

Continue With

同等の比較 (as...as)

不規則な比較級: better, worse, more

最上級：最高と最悪 (-est / most)

〜以上に〜ない：否定における同等性

優先順位の選択: 'Rather Than'を使う

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Adjectives and Adverbs in English - 5 Levels of Difficulty

Adjectives & Adverbs | English Grammar Lesson | B1-Intermediate

English Grammar - Adjectives & Adverbs

Related Grammar Rules

複合時制における副詞の語順 (Always, Never, Often)

形容詞を強調する: Very, So, Really, Too

副詞の位置：様態と程度

視点・態度副詞 (技術的には、率直に言って)

'so' と 'such a' で強調する

コメント (0)

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