Transitive and intransitive pairs

What are transitive and intransitive pairs?

In Japanese, many verbs come in pairs: one transitive (他動詞) and one intransitive (自動詞). The transitive verb takes a direct object and indicates that someone or something causes an action. The intransitive verb does not take a direct object and indicates that something happens on its own or changes state.

For example:

• 開ける（あける）: to open something (transitive) — ドアを開ける (open the door)
• 開く（あく）: to open, to become open (intransitive) — ドアが開く (the door opens)

The same idea appears in many common pairs:

• 閉める（しめる）: to close something / 閉まる（しまる）: to close, to become closed
• 付ける（つける）: to attach something / 付く（つく）: to be attached
• 消す（けす）: to erase, to turn off / 消える（きえる）: to disappear, to go out
• 入れる（いれる）: to put in / 入る（はいる）: to enter
• 出す（だす）: to take out / 出る（でる）: to come out, to leave

Why does Japanese have so many?

Japanese tends to express causation and change with separate verbs rather than using the same verb with different constructions. In English, we often use the same verb both transitively and intransitively: "I opened the door" and "The door opened." Japanese instead has two distinct verbs for these two situations.

This is partly because Japanese verbs carry a lot of grammatical information, and the language prefers to make the distinction between voluntary action and spontaneous change explicit. It also reflects a cultural and linguistic tendency to attribute changes to natural processes or external forces rather than to an implied agent. For example, when a door opens by itself, you use 開く, not 開ける, because no one is performing the action.

The pattern is so systematic that learners can often predict the form of one verb from the other. There are several common patterns:

• -eru transitive / -aru intransitive: 開ける / 開く, 閉める / 閉まる, 付ける / 付く, 止める（とめる） / 止まる（とまる）
• -u transitive / -eru intransitive: 出す / 出る, 入れる / 入る, 起こす（おこす） / 起きる（おきる）
• -su transitive / -iru intransitive: 増やす（ふやす） / 増える（ふえる）, 減らす（へらす） / 減る（へる）
• -u transitive / -aru intransitive: 壊す（こわす） / 壊れる（こわれる）, 直す（なおす） / 直る（なおる）

These patterns are not absolute, but they help in guessing the counterpart of a new verb.

How to stop mixing them up

The most common mistake learners make is using the transitive verb where the intransitive is needed, or vice versa. Here are some strategies to keep them straight:

1. Look at the particle. Transitive verbs take を (the object marker). Intransitive verbs take が (the subject marker). If you see を, the verb must be transitive. If you see が, it is likely intransitive. For example, ドアを開ける vs. ドアが開く.

1. Think about who is doing the action. Ask yourself: Is someone doing something to something else? If yes, use the transitive. Is something happening by itself? Use the intransitive. For instance, if you drop a glass and it breaks, you say グラスが割れる（われる） (the glass breaks), not グラスを割る（わる） unless you deliberately broke it.

1. Memorize pairs in context. Instead of memorizing isolated verbs, learn them as a set with example sentences. For example, 電気を消す (turn off the light) and 電気が消える (the light goes off).

1. Practice with the patterns. Recognizing the ending patterns helps you remember which is which. For example, -aru verbs are almost always intransitive, and -eru verbs are often transitive, but not always (e.g., 食べる is transitive, but 出る is intransitive). So use patterns as a guide, not a rule.

1. Use the causative and passive forms as a check. If you know the transitive verb, you can often form the intransitive-like meaning with the passive or the potential form, but that is not the same as the true intransitive. For example, 開けられる means "can be opened" or "is opened," not "opens by itself." The true intransitive 開く is simpler and more natural for spontaneous change.

Common pairs to learn early

Here is a list of high-frequency pairs that appear in daily conversation and on the JLPT:

• 開ける / 開く (open)
• 閉める / 閉まる (close)
• 付ける / 付く (attach, turn on)
• 消す / 消える (erase, turn off, disappear)
• 入れる / 入る (put in, enter)
• 出す / 出る (take out, come out)
• 起こす / 起きる (wake someone, wake up)
• 決める / 決まる (decide, be decided)
• 変える / 変わる (change, be changed)
• 壊す / 壊れる (break, be broken)
• 直す / 直る (fix, be fixed)
• 増やす / 増える (increase, be increased)
• 減らす / 減る (decrease, be decreased)
• 落とす / 落ちる (drop, fall)
• 倒す / 倒れる (knock over, fall over)

Related grammar points

Transitive and intransitive verbs interact with other grammar patterns:

• The causative form (使役形) makes a verb transitive: 開かせる (make someone open).
• The passive form (受身形) often overlaps with intransitive meaning: 開けられる (is opened).
• The potential form (可能形) can express ability: 開けられる (can open).

Understanding these distinctions will help you choose the correct verb form in complex sentences.

For more practice, you can use the Conjugation Dojo to drill verb forms, and the Sentence Builder to practice using them in context. The grammar library has further explanations of related patterns.