All verbs are either transitive (someone performed the action) or intransitive (the action occurred automatically or the actor is not important).
It is important to remember whether a verb is transitive or intransitive since it changes the particles used with the verb.
Transitive verbs are used with an active actor that performed the action, let's look at an example:
開けた 。
I opened the window.
Let's look at the intransitive version of the previous example sentence:
開いた 。
The window was opened.
Intransitive verbs cannot have a direct object since there is no direct actor performing the action.
The following sentence is incorrect:
を 開いた 。
The window was opened.
This means that the particle を cannot be used with intransitive verbs.
A convenient feature of transitive and intransitive verbs is that they often come in pairs, meaning there are two similar verbs using the same kanji that act as a pair (one being transitive and intransitive respectively). It is recommended to learn the two verbs as a pair as they are very similar.
Here's some more very common transitive/intransitive pairs you should remember.
transitive | intransitive |
---|---|
開ける | 開く |
出す | 出る |
落とす | 落ちる |
消す | 消える |
入れる | 入る |