Transitive and Intransitive Verbs in Japanese

Why Japanese pairs verbs that English shares

In English the verb open does double duty. I open the door and the door opens use the same word, and the listener works out from the word order whether a person is involved. Japanese does not lean on word order in that way. Particles mark the roles, and the language keeps separate verbs for the two viewpoints: akemasu when someone opens something, akimasu when something opens. Hundreds of everyday verbs come in pairs like this.

The pairs exist because Japanese likes to describe an event from the position of the thing that changed. A shop opens, a train stops, a meeting starts, a phone breaks. Each of those can be said without naming anyone, and each has a partner verb for when you do want to name the person. Once you see the pairs as two views of one event rather than as unrelated vocabulary, they become far easier to remember and to choose between in conversation.

The particle test that never lies

The reliable way to tell the two apart is the particle on the noun that changes. A transitive verb has a direct object, and that object takes o: mado o akemasu. An intransitive verb has no object, so the window becomes the subject and takes ga: mado ga akimasu. If you can put o in front of the verb without the sentence collapsing, the verb is transitive. If the only natural particle is ga, it is intransitive.

One exception is worth knowing so it does not confuse you. A few intransitive verbs of movement take o for the place you leave or pass through, as in ie o demasu, I leave the house. That o marks a route or a starting point rather than a thing being acted on, and the verb is still intransitive. The general particle guide covers this use of o; for the pairs in this post, treat o as the mark of the transitive member.

The twenty pairs you will use most

Every transitive verb here is a normal verb that happens to have a partner, so it conjugates by its own class. Akeru, shimeru and tsukeru are ichidan verbs, while kesu, dasu and naosu are godan verbs ending in su. The intransitive partners follow the same logic: shimaru and tomaru are godan, ochiru and okiru are ichidan. Nothing about being transitive or intransitive changes how a verb conjugates.

Shape patterns that help you guess

The pairs are not random, and a few tendencies let you guess a new pair with good odds. A verb ending in su is nearly always the transitive member: kesu, dasu, naosu, kowasu, otosu, okosu. A verb ending in aru is nearly always the intransitive member: shimaru, hajimaru, tomaru, kawaru, kimaru. When one partner ends in aru, the other usually ends in eru, so shimaru pairs with shimeru and kimaru with kimeru.

Treat these as tendencies, not rules, because eru on its own proves nothing. Akeru and kimeru are transitive, but kieru and deru are intransitive, and kaeru is transitive in the change pair while kaeru meaning return is a completely different verb. The safe procedure is to use the shape to make a guess, then confirm it with the particle in a real sentence. After a few dozen pairs the guessing becomes accurate enough that you rarely need to check.

• Ends in su: expect transitive, as in naosu, kowasu and otosu.
• Ends in aru: expect intransitive, as in tomaru, kimaru and mitsukaru.
• Aru and eru pair together: shimaru with shimeru, agaru with ageru.
• Ends in eru: could be either, so check the particle before trusting it.
• No partner at all: verbs such as tabemasu and ikimasu describe events that only make sense from one side, so they never pair.

The same event from two sides

Read each row aloud as a pair and notice that only two things move: the particle and the verb. The noun stays the same, the politeness stays the same, and the event is the same. What shifts is whether a person is in the sentence. That is the whole distinction, and hearing it in minimal pairs trains the choice faster than any explanation.

Te imasu: a state left behind or an action under way

The te imasu pattern reads differently depending on which member of the pair it sits on. With an intransitive verb it usually describes the state that resulted from a change: doa ga aite imasu means the door is open, not that it is in the middle of opening. With a transitive verb it usually describes an action in progress: doa o akete imasu means somebody is opening the door right now. Same pattern, opposite feel, and the verb decides.

This is the reading learners get wrong most, because English has one continuous form for both. If you want to say the lights are off, the shop is closed, or the car is stopped, you need the intransitive plus te imasu. Reach for the transitive and you will describe someone in the act of switching, closing or stopping, which is rarely what you mean when you are looking at a dark room.

Te arimasu versus te imasu

Te arimasu attaches to a transitive verb and describes a state that somebody deliberately produced and left in place. Mado ga akete arimasu and mado ga aite imasu both tell you the window is open. The first adds that a person opened it on purpose, usually for a reason, such as airing the room. The second simply reports what you see. Notice that te arimasu keeps the transitive verb but marks the noun with ga, because the thing has become the subject of a state.

In practice te arimasu is the pattern for preparations. Hotels are booked, documents are laid out, drinks are in the fridge, and a name is written on the box. Each of those is a completed arrangement that someone made for later. Te imasu on the intransitive is the pattern for observation. If you are unsure which to use, ask whether you would add because in English: the window is open because I left it that way is te arimasu.

Why speakers prefer the intransitive

Japanese conversation tends to avoid pointing at the person who caused a problem, and the intransitive is the grammar that makes this possible. When a glass breaks in a restaurant, the natural first sentence is koppu ga waremashita, the glass broke, rather than koppu o warimashita, I broke the glass. Both are true. The intransitive lets the speaker report the event and apologise without a spotlight on blame, and the listener does the same in return.

This is not evasion in the way it might sound to an English ear; it is a shared courtesy that keeps small accidents small. The same choice appears when plans change, when a date is fixed, or when a computer stops working. Yotei ga kawarimashita presents a changed plan as a fact everyone now lives with. You will still use the transitive when you take responsibility on purpose, and adding te shimaimashita to either verb expresses regret, but the intransitive should be your default for reporting what went wrong.

Mistakes that give learners away

The most common slip is pairing a transitive verb with ga or an intransitive verb with o, as in kuruma ga tomemasu, which a Japanese listener hears as a car doing the stopping to something else. The second is using the wrong member of the pair for the viewpoint you mean: shichi-ji ni okoshimashita says you woke somebody at seven, while shichi-ji ni okimashita says you got up. The third is reaching for the transitive te imasu to describe a state, which turns a closed shop into someone closing it.

The last two lines are what you say at a hotel front desk, and they show why the intransitive matters for practical Japanese. You are not confessing that you broke anything; you are describing a state so that staff can fix it. A likely reply is sugu ni kakari no mono ga mairimasu, someone will come right away.

A drill that builds the reflex

• Take ten pairs from the table and say each one in a two-line set: mado o akemasu, mado ga akimasu, without pausing between them.
• Look at your room and describe five states with intransitive te imasu: denki ga tsuite imasu, doa ga shimatte imasu.
• Turn each of those five into the action that caused it, using the transitive and mashita.
• Say three preparations you have made with te arimasu, then say the same three as plain states with te imasu, and notice the difference in feel.
• Report two small accidents twice, once with ga and once with o, and decide which one you would actually say to a colleague.