増える

The Japanese verb 増える (ふえる, fueru) is a fundamental vocabulary word that translates to 'to increase,' 'to multiply,' or 'to grow' in English. It is an intransitive verb (自動詞, jidoushi), which is a crucial grammatical distinction in Japanese. This means that the action happens on its own or describes a state of change without a direct object receiving the action. When you use 増える, you are stating that something has increased in number, quantity, or degree, rather than saying that someone has actively increased it. Understanding this distinction is vital for mastering Japanese, as English often uses the same word ('increase') for both transitive and intransitive contexts. In Japanese, the subject of the sentence takes the particle が (ga) or は (wa) to indicate what is increasing. For example, you would say 人口が増える (jinkou ga fueru) to mean 'the population increases.' You cannot use the object particle を (o) with 増える. If you want to say 'I will increase the population,' you must use its transitive counterpart, 増やす (fuyasu). This dynamic between intransitive and transitive pairs is a cornerstone of Japanese grammar and reflects a worldview that often distinguishes between natural occurrences and human-induced actions.

Grammatical Classification

Intransitive Ichidan Verb (Group 2). It conjugates by dropping the final 'ru' and adding the appropriate suffix, such as 'masu' for formal speech (増えます).

Core Meaning

To become greater in size, amount, number, or degree. It is typically used for countable nouns or measurable quantities like money, people, weight, and opportunities.

Kanji Breakdown

The kanji 増 (zou/ma.su/fu.eru) consists of the earth radical (土) and a phonetic component (曽) that implies adding layers. Together, it visualizes piling up earth to increase its volume.

People use 増える in a wide variety of everyday situations. It is universally understood and is appropriate for both casual conversations and formal settings, though in highly formal or academic contexts, a Sino-Japanese compound like 増加する (zouka suru) might be preferred. You will frequently hear 増える when discussing personal matters, such as gaining weight (体重が増える, taijuu ga fueru), getting more friends (友達が増える, tomodachi ga fueru), or seeing an increase in one's savings (貯金が増える, chokin ga fueru). It is also heavily used in news and societal discussions. For instance, reports on traffic accidents, economic inflation, or demographic changes will constantly utilize this verb. When reading Japanese news, phrases like 事故が増えている (jiko ga fuete iru - accidents are increasing) or 観光客が増えた (kankoukyaku ga fueta - tourists have increased) are incredibly common. The continuous form, 増えている (fuete iru), is particularly useful because it describes an ongoing trend of increase, which is how we often talk about statistics or evolving situations in the real world.

Using 増える correctly in sentences requires a solid grasp of Japanese sentence structure, particularly the use of particles and verb conjugations. Because 増える is an intransitive verb, the most common sentence pattern is [Noun] + が + 増える. The noun represents the entity that is experiencing the increase. For example, 収入が増える (shuunyuu ga fueru) means 'income increases.' It is important to note that while が is the standard particle for the subject of an intransitive verb, you can also use は (wa) if you are establishing the noun as the topic of the sentence, often for contrast or general statements. For instance, 収入は増えたが、支出も増えた (shuunyuu wa fueta ga, shishutsu mo fueta) means 'Income increased, but expenses also increased.' Beyond the basic subject-verb structure, you will frequently use adverbs to describe how the increase is happening. Words like どんどん (dondon - rapidly/steadily), 急激に (kyuugeki ni - sharply/suddenly), 徐々に (jojo ni - gradually), and 少しずつ (sukoshizutsu - little by little) are excellent companions for 増える. By combining these adverbs with the verb, you can paint a much clearer picture of the situation. For example, 人口が急激に増えている (jinkou ga kyuugeki ni fuete iru) translates to 'The population is increasing rapidly.'

Conjugation Basics

As an Ichidan verb, conjugation is straightforward. Present formal: 増えます (fuemasu). Past formal: 増えました (fuemashita). Negative formal: 増えません (fuemasen). Te-form: 増えて (fuete).

Expressing Trends

Use the V-te iru form (増えている) to express that something is currently in a state of increasing. This is the most natural way to talk about ongoing statistics or phenomena.

Conditional Usage

To say 'if it increases,' use the ba-form: 増えれば (fuereba) or the tara-form: 増えたら (fuetara). Example: お金が増えたら、車を買う (If my money increases, I will buy a car).

Another important grammatical structure to learn with 増える is the use of ~ていく (te iku) and ~てくる (te kuru). These auxiliary verbs add a sense of temporal direction to the increase. 増えていく (fuete iku) implies that the increase will continue from the present into the future. For example, これから高齢者が増えていく (korekara koureisha ga fuete iku) means 'From now on, the elderly population will go on increasing.' Conversely, 増えてくる (fuete kuru) implies that the increase started in the past and has continued up to the present moment. For example, 最近、暑い日が増えてきた (saikin, atsui hi ga fuete kita) means 'Recently, hot days have been increasing (up to now).' Mastering these nuances will make your Japanese sound incredibly natural and fluent. Furthermore, you can use 増える in relative clauses to modify nouns. For example, 増える人口 (fueru jinkou) means 'the increasing population,' and 増えた体重 (fueta taijuu) means 'the gained weight.' This allows you to construct more complex and descriptive sentences without needing to break them into multiple smaller statements.

The verb 増える is ubiquitous in Japanese daily life, media, and professional environments. Because it describes a fundamental concept—growth or addition in quantity—you will encounter it across a vast spectrum of contexts. One of the most common places you will hear 増える is in the news. Japanese news broadcasts frequently discuss demographic shifts, economic indicators, and social trends. Phrases like 少子高齢化で高齢者が増えている (shoushi koureika de koureisha ga fuete iru - the elderly population is increasing due to the declining birthrate and aging population) are staples of daily journalism. Similarly, economic reports will use 増える to discuss inflation, national debt, or corporate profits. For example, 企業の利益が増えた (kigyou no rieki ga fueta - corporate profits increased). In weather forecasts, you might hear about an increase in rainfall or the number of hot days: 夏日が増える見込みです (natsubi ga fueru mikomi desu - the number of summer days is expected to increase). These formal contexts rely heavily on the continuous form (増えている) to describe ongoing societal changes.

Daily Life and Health

People frequently use 増える to talk about their weight (体重が増える), stress levels (ストレスが増える), or the number of items they own (荷物が増える). It is a standard way to express personal changes.

Business and Work

In the workplace, you will hear about workloads increasing (仕事が増える), sales going up (売り上げが増える), or the number of clients growing (顧客が増える). It is essential vocabulary for office environments.

Social Media and Internet

Online, users talk about their followers increasing (フォロワーが増える), the number of views going up (再生回数が増える), or comments multiplying (コメントが増える).

Beyond formal news and business, 増える is a staple of casual conversation among friends and family. You might complain that your chores have increased (家事が増えた, kaji ga fueta) or happily announce that your collection of manga has grown (漫画のコレクションが増えた, manga no korekushon ga fueta). In educational settings, teachers might note that a student's vocabulary has increased (語彙が増えた, goi ga fueta) or that the number of absences is rising (欠席者が増えている, kessekisha ga fuete iru). The word is also prevalent in advertising and marketing. Companies might promote a product by saying it will increase your free time (自由な時間が増える, jiyuu na jikan ga fueru) or that users of their service are rapidly increasing (利用者がどんどん増えています, riyousha ga dondon fuete imasu). Because 増える is so versatile, it is one of those core verbs that you must internalize early in your Japanese learning journey. It bridges the gap between basic survival Japanese and more advanced, nuanced communication about the world around you.

The most frequent and significant mistake English speakers make with 増える is confusing it with its transitive counterpart, 増やす (fuyasu). In English, the word 'increase' functions as both an intransitive verb ('The population increased') and a transitive verb ('I will increase the population'). Japanese strictly separates these two functions. 増える is exclusively intransitive. This means the action happens naturally or describes a state, and the subject takes the particle が (ga). You cannot use the direct object particle を (o) with 増える. For example, saying 貯金を増える (chokin o fueru) is grammatically incorrect and sounds very unnatural to a native speaker. The correct phrasing is 貯金が増える (chokin ga fueru - savings increase). If you want to express that you are actively taking steps to increase your savings, you must use the transitive verb 増やす and the particle を: 貯金を増やす (chokin o fuyasu - I will increase my savings). This distinction is a major hurdle for beginners, but mastering it is essential for clear and accurate communication in Japanese.

Mistake 1: Using the wrong particle

Incorrect: 友達を増える (tomodachi o fueru). Correct: 友達が増える (tomodachi ga fueru). Remember, intransitive verbs take が, not を.

Mistake 2: Confusing 増える with 増やす

If you want to say 'I will increase my vocabulary,' you must use the transitive verb: 語彙を増やす (goi o fuyasu). Saying 語彙が増える means 'my vocabulary increases (on its own).'

Mistake 3: Confusing it with 上がる (agaru)

上がる means 'to rise' or 'to go up' (like temperature, prices, or levels). 増える means 'to increase in number or quantity.' You say 値段が上がる (prices rise), not 値段が増える.

Another common mistake is confusing 増える with other verbs that imply an upward trend, specifically 上がる (agaru - to rise) and 多くなる (ooku naru - to become many). While they seem similar in English, their usage in Japanese is distinct. 増える is used when a measurable quantity, volume, or number becomes larger. For example, the number of people (人が増える) or the amount of money (お金が増える). On the other hand, 上がる is used for things that move upward on a scale, such as temperature (温度が上がる), prices (物価が上がる), or skill levels (レベルが上がる). Saying 値段が増える (nedan ga fueru) sounds strange because a price is a point on a scale, not a quantity of items. Furthermore, 多くなる is an adjective-derived phrase meaning 'to become numerous.' While 人が多くなる (hito ga ooku naru) and 人が増える (hito ga fueru) can sometimes be used interchangeably to mean 'the number of people increases,' 増える emphasizes the process of addition or multiplication, whereas 多くなる simply describes the resulting state of being numerous. Understanding these subtle differences will greatly improve your vocabulary precision.

While 増える is the most common and versatile word for 'to increase' in Japanese, there are several synonyms and related terms that are used in specific contexts or to convey different nuances. Understanding these alternatives will enrich your vocabulary and allow you to express yourself more precisely. The most direct formal equivalent is the Sino-Japanese compound 増加する (zouka suru). This word shares the same kanji (増) and means exactly the same thing, but it is much more formal. You will see 増加する in academic papers, official government reports, and formal news broadcasts. For example, 人口が増加している (jinkou ga zouka shite iru) sounds more analytical and objective than 人口が増えている. Another related term is 上昇する (joushou suru), which means 'to rise' or 'to ascend.' Like 上がる (agaru), it is used for things that move up a scale, such as temperatures, prices, or rankings, rather than things that multiply in quantity. For instance, 気温が上昇する (kion ga joushou suru - the temperature rises). Knowing when to use a native Japanese verb (和語, wago) like 増える versus a Sino-Japanese compound (漢語, kango) like 増加する is a key part of mastering Japanese register and formality.

増加する (zouka suru)

The formal, written equivalent of 増える. Used in news, statistics, and academic contexts. Example: 交通事故が増加している (Traffic accidents are increasing).

多くなる (ooku naru)

Literally 'to become many.' It focuses on the resulting state of abundance rather than the process of increasing. Example: 最近、外国人の観光客が多くなった (Recently, foreign tourists have become numerous).

伸びる (nobiru)

Means 'to stretch' or 'to grow.' Often used for abstract concepts like sales, skills, or records. Example: 会社の売り上げが伸びている (The company's sales are growing).

Other alternatives include words that describe specific types of growth or expansion. 膨らむ (fukuramu) means 'to swell' or 'to expand,' and is often used for things that physically inflate, like a balloon, but it can also be used metaphorically for things like budgets, expectations, or debt (借金が膨らむ - debt swells). 拡大する (kakudai suru) means 'to expand' or 'to enlarge,' and is typically used for businesses, territories, or the scale of an event (事業を拡大する - to expand a business). 成長する (seichou suru) means 'to grow,' but it is specifically used for living things like children, plants, or the overall growth of a company or economy (経済が成長する - the economy grows). Finally, 殖える (fueru) is a homophone of 増える and is conjugated exactly the same way, but it uses a different kanji. 殖える is specifically used for the multiplication or reproduction of living things, such as animals, plants, or bacteria, as well as the accumulation of wealth or assets through investment. For example, 牛が殖える (ushi ga fueru - the cows multiply) or 財産が殖える (zaisan ga fueru - assets multiply). However, in modern everyday Japanese, the kanji 増 is often used as a catch-all, and you will rarely be penalized for using 増える instead of 殖える.