A2 Conjunctions & Connectors 13 min read かんたん

'Because' を使って理由を述べる

「because」は、英語で何かの「理由」や「原因」を説明するためのカギになる魔法の言葉です！
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Grammar Rule in 30 Seconds

Use 'because' to connect an action to its reason, answering the question 'Why?'.

  • Use 'because' before a full subject + verb clause: 'I slept because I was tired.'
  • No comma is needed when 'because' is in the middle of the sentence.
  • If you start with 'because', you MUST use a comma after the first clause.
Result + 🔗 because + Reason (Subject + Verb)

Overview

昨日の夜、なんで3時間もTikTokで猫の動画を流(なが)し見しちゃったんだろう？ダイエット中のはずなのに、なんで特大サイズのピザを頼んじゃったの？英語では、あらゆる行動にその背景となるストーリーがあるんだ。because という言葉は、そのストーリーを語るためのチケットだよ。これは、行動（結果）とその動機（理由）をつなぐ、最も一般的な方法だね。because がないと、会話はただバラバラな事実を並べているだけになっちゃう。「遅れました。バスが事故に遭いました。」なんて言うのを想像してみて。まるでニュースを伝えているロボットみたいだよね！そこに because を加えるだけで、君はストーリーテラーになれるんだ。「バスが事故に遭ったから、遅れちゃったんだ。」これで友達も、君の身に何が起きたのかをちゃんと理解してくれる。because は英語における「架け橋」だと考えてみて。聞き手を「何が起きたか」から「なぜ起きたか」へと運んでくれるんだ。言い訳をしたり、褒め言葉を贈ったり、最近ハマっているNetflixの作品を説明したりするのに、これ以上のツールはないよ。ただ、お母さんに返信していない理由を説明するのには使わないほうがいいかもね。世の中には謎のままにしておいたほうがいいこともあるからさ。

How This Grammar Works

核心を突くと、 because は従属接続詞(じゅうぞくせつぞくし)っていうものなんだ。難しく聞こえるけど、要するに文の2つの部分をくっつける役割を持っているってこと。片方がメインの考え（「主節(しゅせつ)」）、もう片方がその説明（「従属節(じゅうぞくせつ)」）になるんだ。 because の魔法は、常に「理由」を導き出すことにある。適当な場所に置けばいいってわけじゃないよ。「なぜ？」という疑問に答える部分の直前に置く必要があるんだ。例えば、「I'm tired because I stayed up gaming（ゲームで夜更かししたから疲れている）」と言えば、夜更かしが理由になるよね。もしこれをひっくり返して「I stayed up gaming because I'm tired」なんて言ったら、友達は君の休息方法がかなり独特だと思っちゃうかも！現代の英語では、メッセージやメール、さらにはミームでも絶えず使われているよ。めちゃくちゃに散らかった部屋の写真に「Because kids（子供だからね）」なんてキャプションがついているのを見たことがあるかもしれない。これは今風の省略された使い方だけど、A2レベルの君は、まずは文法的に正しいフルセンテンスをマスターすることに集中しよう。インスタライブでバク宙を披露する前に、まずは歩き方を覚えるようなものだね。

Formation Pattern

1
because を使った文の作り方には、主に2つのパターンがあるよ。
2
The Standard Way (Middle Placement):
3
[結果/行動] + because + [主語] + [動詞] + [理由の残り].
4
例文:
I missed the call because my phone was on silent.
（マナーモードにしていたから、電話に出られなかった。）
5
注意: このパターンでは、通常 because の前にカンマを入れる必要はないよ。
6
The Emphatic Way (Beginning Placement):
7
because + [主語] + [動詞] + [理由], + [結果/行動].
8
例文: "Because the Wi-Fi was down, I couldn't join the Zoom meeting."（Wi-Fiが落ちていたので、Zoom会議に参加できなかった。）
9
注意: because で文を始める時は、理由の節の後に必ずカンマを入れなきゃいけない。メインの出来事が来る前に、読み手に一呼吸置かせてあげるんだ。
10
The Short Answer (Informal):
11
Q:
Why are you laughing?
（なんで笑ってるの？）
12
A:
Because this meme is hilarious.
（このミームが超面白いから。）
13
日常会話やメッセージでは、質問に答える時に because だけで始めることがよくあるんだ。フォーマルな作文では「不完全な文」扱いになっちゃうけど、WhatsAppなら全然OK。ただ、IELTSの試験でやっちゃダメだよ。スコアがSnapchatのメッセージみたいに消えちゃうからね。

When To Use It

because は、ほぼすべての会話で使うことになるはず。よくあるシチュエーションを挙げておくね。
  • 言い訳をする時: "I can't go to the gym because I'm 'busy' (watching Netflix)."（「忙しい」からジムに行けないんだ。）
  • 褒め言葉を贈る時:
    I like your profile picture because you look so happy!
    （すごく幸せそうに見えるから、そのプロフィール写真好きだな！）
  • 感情を説明する時: "I'm stressed because my exam is tomorrow."（明日試験だからストレスが溜まってるんだ。）
  • 選択を正当化する時:
    I bought these shoes because they were on sale.
    （セールだったから、この靴を買ったんだ。）
  • SNSのキャプション:
    Traveling to Bali because I need a break from reality.
    （現実逃避が必要だから、バリ島へ旅行中。）
  • 就職面接:
    I want this job because I am passionate about coding.
    （コーディングに情熱を持っているので、この仕事を志望します。）
  • ゲーム:
    We lost the match because my ping was too high!
    （ラグがひどかったから負けたんだ！ —— ゲーマー定番の言い訳だね）。
基本的に、誰かに「なんで？」と聞かれたら、 because が真っ先に駆けつけてくれる。文法界の110番みたいなもので、何かトラブルを説明しなきゃいけない時にいつも助けてくれるんだ。

Common Mistakes

  1. 1The Because of Trap: 多くの人が because と because of を混同しちゃうんだ。
  • because + 文（主語 + 動詞）を使う:
    I stayed home because it rained.
  • because of + 名詞を使う:
    I stayed home because of the rain.
  • 間違い:
    I stayed home because the rain.
    （これだと、よちよち歩きの幼児と話しているみたいに聞こえちゃう）。
  1. 1The Comma Drama: さっきも言ったけど、文の途中で because の前にカンマを置かないように。
  • 間違い: "I'm late, because I slept in."
  • 正解: "I'm late because I slept in."
  1. 1Starting and Stopping: because で文を始めたのに、後半部分を言い忘れないようにね。
  • 間違い:
    Because I was hungry.
  • 正解:
    I ate a sandwich because I was hungry.
  1. 1Overusing It: プロフェッショナルな文章では、すべての文に because を使わないようにしよう。文章がくどく見えちゃうからね。インスタの投稿すべてに同じフィルターを使うようなもので、そのうちみんなに飽きられちゃうよ。

Contrast With Similar Patterns

  • Because vs. So: これらは表裏一体の関係。 because は理由を、 so は結果を導くんだ。
  • 理由にフォーカス: "I'm hungry because I didn't eat breakfast."（朝食を食べていないから、お腹が空いている。）
  • 結果にフォーカス: "I didn't eat breakfast, so I'm hungry."（朝食を食べていない、だからお腹が空いている。）
  • so を前進ギア、 because をバックギアだと考えてみて。
  • Because vs. As / Since: これらは because よりもフォーマルな言い方だよ。
  • カジュアル: "I'm staying in because it's cold."（寒いから家にいるよ。）
  • フォーマル:
    As the weather is inclement, I shall remain indoors.
    （19世紀の詩人や、すごく真面目な弁護士みたいに聞こえたいなら使ってみて。）
  • Because vs. Due to: Due to はとてもフォーマルで、普通は be動詞の後に続くんだ。
  • The delay was due to heavy traffic.
    （遅延は激しい渋滞によるものでした。）
  • バーで友達にこんな言い方はしないよね。普通に「I'm late because the traffic sucked（渋滞が最悪だったから遅れたわ）」って言えばいいよ。

Quick FAQ

Q

because で文を始めてもいいの？

もちろん！前半部分の後にカンマを入れるのを忘れないでね。

Because I was tired, I went to bed.

Q

cause は because と同じ？

会話やメッセージならその通り。よく

cause
とか "'cause« って言うよ。でも、書く時は常にフルで書くこと。 »Cause« は親友用、 »because" は上司用だね。

Q

because は絶対に理由を説明しなきゃいけないの？

普通はそうだね。でも最近のスラング（ネット用語）では、前置詞みたいに使われることもある。「I'm tired because Monday（月曜日だから疲れてる）」みたいにね。面白いけど、学校では使っちゃダメだよ！

Q

なんで because はそんなに重要なの？

これがないと、ただ事実を述べているだけになっちゃう。これがあれば、自分の考えを説明できるんだ。君を単なる「データの一部」から「個性のある人間」に変えてくれる言葉だよ。

Sentence Structure with 'Because'

Position Structure Example
Middle
Result + because + Reason
I'm eating because I'm hungry.
Beginning
Because + Reason + , + Result
Because I'm hungry, I'm eating.
Negative
Result + because + Negative Reason
I'm sad because you aren't here.
Question
Why + Question Form + because...?
Why are you late? Because I missed the bus.

Informal Contractions

Full Form Short Form Usage
because
'cause
Spoken English / Songs
because
bc
Texting / Social Media
because
cos / coz
British Informal Spoken

Meanings

A conjunction used to introduce a clause that explains the reason or cause for something mentioned in the main clause.

1

Direct Cause

Explaining the physical or logical cause of an event.

“The grass is wet because it rained.”

“He failed the test because he didn't study.”

2

Motivation/Justification

Explaining the personal reason or motive behind a human action.

“I called you because I missed you.”

“She went to the store because she needed milk.”

3

Informal Shortening

Using 'cause' or 'bc' in casual speech or texting.

“I'm staying home 'cause I'm tired.”

“I can't go bc I have work.”

Reference Table

Reference table for 'Because' を使って理由を述べる
構造 目的 例 メモ
メインの文節 + because の文節
メインの文節の理由を説明
I'm happy `because` it's Friday.
カンマは必要ありません。
Because の文節 + カンマ + メインの文節
理由を強調
`Because` it's raining, we'll stay inside.
カンマが必須です！
「Why?」の質問に答える
直接的な理由を述べる
Q: Why are you late? A: `Because` the bus was slow.
短い返事でよく使われます。
Because vs. Because of
完全な文節（主語+動詞）をつなぐ vs. 名詞をつなぐ
I'm tired `because` I worked late. / I'm tired `because of` the work.
`Because of` の後には名詞または名詞句が必要です。
非公式な省略形
素早いテキストメッセージ
Can't meet `bc` I'm busy.
ごくカジュアルなコミュニケーションでのみ使用します。

フォーマル度スペクトル

フォーマル
The event was delayed because the weather conditions were unfavorable.

The event was delayed because the weather conditions were unfavorable. (Weather delay)

ニュートラル
The party was late because it was raining.

The party was late because it was raining. (Weather delay)

カジュアル
We're late 'cause of the rain.

We're late 'cause of the rain. (Weather delay)

スラング
Late bc rain is trash.

Late bc rain is trash. (Weather delay)

「Because」の力

Because

機能

  • Reason なぜ何かが起こるか
  • Explanation 詳細の明確化

構造1

  • Main Clause + Because Clause カンマ不要
  • Example I'm happy because it's Friday

構造2

  • Because Clause, + Main Clause カンマが必要
  • Example Because it's raining, we stayed in

よくある間違い

  • No comma (initial) 文頭に「because」が来るとき
  • Because + So 両方使わない
  • Because of + Clause 名詞/名詞句が必要

「Because」 vs. 「So」 vs. 「Because of」

Because
理由（節）をつなぐ I'm late because I missed the bus.
「Why?」に答える Why are you tired? Because I worked late.
So
結果（節）をつなぐ I missed the bus, so I'm late.
結果を示す It was raining, so we stayed inside.
Because of
理由（名詞/句）をつなぐ I'm late because of the traffic.
名詞/代名詞の後に続く Because of him, we won.

「Because」の使い方フローチャート

1

何かが起こった「理由」を説明したいですか？

YES
「because」を使いましょう。
NO
「so」などの接続詞を検討しましょう。
2

理由は完全な文（主語 + 動詞）ですか？

YES
「because」を使いましょう（例：「because I was tired」）
NO
「because of」 + 名詞/名詞句を使いましょう（例：「because of the rain」）
3

「because」が文全体の最初にきますか？

YES
「because」節の後にカンマを追加しましょう（例：「Because it's cold, I wore a jacket.」）
NO
「because」の前にカンマは必要ありません（例：「I wore a jacket because it's cold.」）

日常の「Because」の場面

🗣️

日々の説明

  • • なぜ遅れたのか
  • • なぜ嬉しいのか
  • • なぜ何かを選んだのか
📱

デジタルライフ

  • • 「bc」でテキスト
  • • Netflixのプロットの理由
  • • ゲームの言い訳
🎓

学業・仕事

  • • プロジェクトの決定を正当化
  • • 遅延の説明
  • • プレゼンテーションの理由付け
💖

個人的な好み

  • • なぜその歌が好きか
  • • なぜ特定の食べ物を好むか
  • • なぜその趣味を選んだか
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レベル別の例文

1

I am sad because I am tired.

2

She eats because she is hungry.

3

I like him because he is funny.

4

They run because they are late.

1

I'm wearing a coat because it's cold outside.

2

Because the shop was closed, I went home.

3

He is studying hard because he has an exam.

4

We are happy because we won the game.

1

I decided to move because I wanted a better life.

2

Because I hadn't seen her for years, I didn't recognize her.

3

The flight was cancelled because there was a pilot strike.

4

I'm telling you this because I trust you.

1

The project failed not because of a lack of money, but because we lacked time.

2

I didn't go because I was tired, but because I had work to do.

3

Because the evidence was inconclusive, the case was dismissed.

4

She's successful because she never gives up on her dreams.

1

It must be late, because the streetlights have already come on.

2

Just because you're older doesn't mean you're always right.

Just because... doesn't mean...

3

The economy is struggling, largely because of global supply chain issues.

4

I'm hesitant to join, simply because I don't have the bandwidth right now.

1

The theory is flawed, if only because it ignores the fundamental laws of physics.

2

He resigned, not because he was forced out, but because his integrity demanded it.

3

Because of the sheer volume of data, the analysis took months to complete.

4

I'm doing this because... well, because science.

間違えやすい

Giving Reasons with 'Because' 対 Because vs. So

Learners mix up the cause and the result.

Giving Reasons with 'Because' 対 Because vs. Since

They both give reasons, but 'since' also refers to time.

よくある間違い

✗

I am late because the rain.

✓

I am late because it is raining.

'Because' needs a verb. Use 'because of' for nouns.
✗

Why you are late? Because I missed bus.

✓

Why are you late? Because I missed the bus.

Don't forget the article 'the' and correct question word order.
✗

Because I was tired, so I went to bed.

✓

Because I was tired, I went to bed.

Do not use 'because' and 'so' in the same sentence. It is redundant.
✗

Because it was raining I stayed home.

✓

Because it was raining, I stayed home.

Missing comma after the first clause when starting with 'Because'.
✗

I didn't go because of I was sick.

✓

I didn't go because I was sick.

Using 'because of' before a clause (subject + verb).
✗

The reason is because...

✓

The reason is that...

In formal writing, 'the reason is because' is considered redundant.

文型パターン

I am ___ because ___.

Because it was ___, I ___.

I can't ___ because I have to ___.

Real World Usage

Texting a friend constant

Can't come bc I'm sick.

Job Interview common

I am a good leader because I listen to my team.

Ordering Food occasional

No cheese, please, because I have an allergy.

Social Media very common

Living my best life because I finally graduated!

Doctor's Visit common

My head hurts because I didn't sleep.

Travel/Airport common

The flight is delayed because of a technical issue.

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💡

カンマはあなたの友達！

「Because」で文を始める時は、メインの文節の前に必ずカンマを入れましょう。理由と結果がどこで区切れるか、相手に伝わりやすくなりますよ。「Because it's important, I'm telling you this!」
⚠️

because と so は一緒に使わない！

「because」は理由を、「so」は結果を伝えます。同じ原因と結果を一つの簡単な文で両方使うのは避けましょう。どちらか一つを選んでくださいね。「I was tired, so I went to bed.」または「I went to bed because I was tired.」
🎯

because を使った短い返事

誰かに「Why...?」と聞かれたら、返事をすぐに「Because」で始めてもOKです。とても自然な会話になりますよ。Q: 「Why are you smiling?」 A: 「Because I heard a funny joke!」
🌍

テキストメッセージの省略形「bc」

とてもカジュアルなテキストやチャットでは、「because」を「bc」と省略して書くことがあります。友達との会話で使うのは一般的ですが、先生や上司には使わないでくださいね！

Smart Tips

Imagine they are two magnets that repel each other. You can only have one in your sentence!

Because I'm tired, so I'm going home. → Because I'm tired, I'm going home.

Read the sentence out loud. If you start with 'Because', you naturally pause in the middle—that's where the comma goes.

Because it was cold I wore a hat. → Because it was cold, I wore a hat.

Use 'bc' or 'cause' for friends, but never for your boss!

I will be late because there is traffic. → Late bc traffic is crazy.

Try starting the sentence with 'Because' instead of always putting it in the middle to vary your writing style.

I like summer because it's hot. I like the beach because it's fun. → I like summer because it's hot. Because the beach is fun, I go there often.

発音

buh-KUZ

The Weak 'Because'

In fast speech, the first syllable 'be-' is very short, sounding like /bɪˈkəz/ or even just /kəz/.

be-CAUSE

Stress Pattern

The stress is on the second syllable: be-CAUSE.

Comma Pause

Because it was raining [pause], I stayed home.

The slight rise in pitch before the comma signals more information is coming.

暗記しよう

記憶術

B-E-C-A-U-S-E: Big Elephants Can Always Understand Small Elephants.

視覚的連想

Imagine a giant bridge labeled 'BECAUSE'. On one side of the river is the 'Action' (running) and on the other side is the 'Reason' (a lion). The bridge connects them.

Rhyme

Don't use 'so' and 'because' together, or you'll be wrong in any weather!

Story

A boy was late for school. He told his teacher, 'I am late `because` my alarm broke.' The teacher asked 'Why?' again. He said, '`Because` I dropped it.' Now he uses `because` to explain everything.

Word Web

whyreasoncausesinceasresultexplanation

チャレンジ

Write 3 sentences about your day using 'because'. One must start with 'Because' and use a comma!

文化メモ

In many English-speaking schools, children are taught 'never start a sentence with because.' This is a myth to prevent fragments, but it is perfectly fine in adult writing if the sentence is complete.

The 'Because [Noun]' meme (e.g., 'Because science') is used to give a humorous, short explanation for something complex.

English speakers often use 'because' to soften a 'no' answer. Just saying 'No' is rude; adding a reason makes it polite.

From Middle English 'bi cause', a loan-translation of Old French 'par cause'.

会話のきっかけ

“

Why did you choose to learn English?

“

Why is your favorite city so special to you?

“

Why do you think some people prefer cats over dogs?

日記のテーマ

Write about a time you were late. Why did it happen?
Why is your best friend your best friend?
Explain why you like your favorite hobby.

よくある間違い

Incorrect

正解

Incorrect

正解

Incorrect

正解

Incorrect

正解

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Test Yourself

正しい接続詞を選びましょう。

I'm learning English ___ I want to travel.

✓ Correct! ✗ Not quite. Correct answer: because
文の後半が英語を学んでいる理由を述べています。「Because」は理由を導入するために使われます。
間違いを見つけて修正しましょう。 Error Correction

Find and fix the mistake:

Because it was raining I took an umbrella.

✓ Correct! ✗ Not quite. Correct answer: Because it was raining, I took an umbrella.
「because」が文頭に来る場合、「because」節の後にカンマが必要です。
正しい英語の文を入力しましょう。 翻訳

Translate into English: 'Estoy cansado porque trabajé mucho.'

Answer starts with: ["I...

✓ Correct! ✗ Not quite. Correct answer: ["I am tired because I worked a lot.","I'm tired because I worked a lot."]
この文は疲れている理由（「I worked a lot」）を説明しています。「Because」は二つのアイデアをつなげます。
正しい文はどれですか？ 選択問題

Choose the correct sentence:

✓ Correct! ✗ Not quite. Correct answer: She is happy because she got a new job.
「because」が文の途中にある場合、通常、その前にカンマは必要ありません。

Score: /4

練習問題

8 exercises
Choose the correct word to complete the sentence. 選択問題

I am wearing a sweater ___ I am cold.

✓ Correct! ✗ Not quite. Correct answer: because
We use 'because' to introduce the reason (being cold).
Find the mistake in the sentence. Error Correction

Find and fix the mistake:

Because I was late, so I missed the meeting.

✓ Correct! ✗ Not quite. Correct answer: Remove 'so'
You cannot use 'because' and 'so' in the same sentence.
Fill in the blank with 'because' or 'because of'.

We stayed home ___ the rain.

✓ Correct! ✗ Not quite. Correct answer: because of
'The rain' is a noun phrase, so we use 'because of'.
Put the words in the correct order. Sentence Reorder

happy / because / I / am / passed / I / the / test

✓ Correct! ✗ Not quite. Correct answer: I am happy because I passed the test.
The standard order is Result + because + Reason.
Match the result with the reason. Match Pairs

1. I'm tired. 2. I'm eating. 3. I'm happy.

✓ Correct! ✗ Not quite. Correct answer: 1-C, 2-A, 3-B
Logical matching of causes and effects.
Which sentence is punctuated correctly? 選択問題

Choose the correct sentence.

✓ Correct! ✗ Not quite. Correct answer: Because it was hot, I went swimming.
A comma is required when 'Because' starts the sentence.
Complete the sentence.

I'm learning English ___ I want a better job.

✓ Correct! ✗ Not quite. Correct answer: because
The desire for a job is the reason for learning English.
Correct the sentence. Error Correction

Find and fix the mistake:

I am late because the traffic was.

✓ Correct! ✗ Not quite. Correct answer: I am late because the traffic was bad.
'Because' needs a full clause (Subject + Verb + Adjective/Noun).

Score: /8

Practice Bank

12 exercises
`because` か `because of` で文を完成させましょう。 穴埋め問題

I couldn't go to the party ___ my illness.

✓ Correct! ✗ Not quite. Correct answer: because of
文を完成させましょう。 穴埋め問題

She learned Spanish quickly ___ she lived in Madrid for a year.

✓ Correct! ✗ Not quite. Correct answer: because
間違いを見つけて修正しましょう。 Error Correction

He was hungry, because he ate a big meal.

✓ Correct! ✗ Not quite. Correct answer: He was hungry, so he ate a big meal.
文を修正しましょう。 Error Correction

Because of she studied hard, she passed the exam.

✓ Correct! ✗ Not quite. Correct answer: Because she studied hard, she passed the exam.
正しい「because」の使い方の文を選びましょう。 選択問題

Choose the best option:

✓ Correct! ✗ Not quite. Correct answer: I missed the bus because I woke up late.
文法的に正しい文を選びましょう。 選択問題

Which sentence is correct?

✓ Correct! ✗ Not quite. Correct answer: Because the concert was sold out, we couldn't get tickets.
英語に翻訳しましょう：「Ella sonríe porque está feliz.」 翻訳

Translate into English: 'Ella sonríe porque está feliz.'

✓ Correct! ✗ Not quite. Correct answer: ["She smiles because she is happy.","She's smiling because she's happy."]
英語に翻訳しましょう：「Debido a que el tráfico era intenso, llegamos tarde a la reunión.」 翻訳

Translate into English: 'Debido a que el tráfico era intenso, llegamos tarde a la reunión.'

✓ Correct! ✗ Not quite. Correct answer: ["Because the traffic was heavy, we were late for the meeting.","We were late for the meeting because the traffic was heavy."]
単語を正しい順序に並べて正しい文を作りましょう。 Sentence Reorder

これらの単語を並べ替えて文を作りましょう：

✓ Correct! ✗ Not quite. Correct answer: I went to bed early because I was tired.
単語を並べ替えて文法的に正しい文を作りましょう。 Sentence Reorder

これらの単語を並べ替えて文を作りましょう：

✓ Correct! ✗ Not quite. Correct answer: Because the weather was bad, the flight was cancelled.
行動を正しい理由と「because」を使って一致させましょう。 Match Pairs

行動とその理由を一致させましょう：

✓ Correct! ✗ Not quite. Correct answer: matched
結果と理由を一致させ、「because」が理由の最初にくる場合は正しいカンマの使用を確認しましょう。 Match Pairs

結果とその理由を一致させましょう：

✓ Correct! ✗ Not quite. Correct answer: matched

Score: /12

よくある質問 (8)

Yes! It is perfectly natural. Just remember to put a comma after the first part of the sentence. Example: `Because I was tired, I went to sleep.`

Usually, no. In standard English, we don't put a comma before `because` when it's in the middle. Example: `I'm happy because it's Friday.`

`Because` introduces the reason (I'm eating `because` I'm hungry). `So` introduces the result (I'm hungry, `so` I'm eating).

In casual speaking and texting, yes. In formal writing or exams, always use the full word `because`.

In informal speech, people sometimes say 'Because!' as a way of refusing to give a reason. However, usually, you should follow it with a sentence.

Use `because of` when the reason is just a noun. Example: `I'm late because of the rain.` Use `because` when the reason is a full sentence: `I'm late because it is raining.`

Yes, they are very similar. `Since` is slightly more formal and often used when the reason is already known by the listener.

It is a common abbreviation for 'because' used to save time while typing on mobile phones.

Scaffolded Practice

1

1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

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In Other Languages

Spanish high

porque

English uses 'why' for questions and 'because' for answers; Spanish uses 'por qué' and 'porque'.

French high

parce que

French has more distinct words for 'because' depending on formality (car vs parce que).

German moderate

weil

Word order: English is 'because I AM tired', German is 'weil ich müde BIN'.

Japanese low

から (kara) / ので (node)

Position: Japanese puts the 'because' word *after* the reason; English puts it *before*.

Arabic moderate

لأن (li'anna)

Arabic 'because' often attaches directly to the subject pronoun (e.g., 'because-he').

Chinese moderate

因为 (yīnwèi)

Redundancy: Chinese uses 'Because... so...' together; English only uses one.

Learning Path

Prerequisites

Next
結果の接続詞: So (原因と結果)

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