Particles を / に / で

You’ll be able to

Use を (o) to mark the direct object of a verb
Use に (ni) for destination, time, and indirect object
Use で (de) for the location of an action and the means used

を marks the direct object

The particle を (written を, pronounced o) marks the direct object — the thing the verb acts on. It comes right after the object noun: 本を読みます (Hon o yomimasu, “[I] read a book”), 日本語を勉強します (Nihongo o benkyō shimasu, “[I] study Japanese”). Because Japanese is verb-final, を helps you spot the object no matter where it sits: 私は毎日日本語を話します (Watashi wa mainichi Nihongo o hanashimasu, “I speak Japanese every day”).

に: destination, time, and recipient

The particle に (ni) has several tight uses. It marks a destination or direction: 学校に行きます (Gakkō ni ikimasu, “[I] go to school”). It marks a specific point in time: 七時に起きます (Shichi-ji ni okimasu, “[I] get up at seven”). And it marks the indirect object / recipient: 友達に手紙を書きます (Tomodachi ni tegami o kakimasu, “[I] write a letter to a friend”). Think of に as pinning an action to a target point — in space, in time, or a person.

で: place of action and means

The particle で (de) marks where an action takes place and the means or tool used. Location of action: 図書館で勉強します (Toshokan de benkyō shimasu, “[I] study at the library”). Means: バスで行きます (Basu de ikimasu, “[I] go by bus”), 日本語で話します (Nihongo de hanashimasu, “[I] speak in Japanese”). The key contrast with に is: に marks a destination or a point of existence, で marks the scene where dynamic action happens.

Worked example

Translate “I study Japanese at the library every day,” then explain why each particle (を, に, で) is or is not used.

1.The object being acted on is 日本語 (“Japanese”), so mark it with を: 日本語を.
2.The place where the studying happens is 図書館 (“library”); an action location takes で: 図書館で.
3.毎日 (mainichi, “every day”) is a relative time word that takes no particle, so it stands alone.
4.Put it in verb-final order with the topic 私は and verb 勉強します at the end.

Answer: 私は毎日図書館で日本語を勉強します。(Watashi wa mainichi toshokan de Nihongo o benkyō shimasu.) “I study Japanese at the library every day.” で marks the location of the action (library), を marks the object (Japanese), and 毎日 needs no particle. に is not used because there is no destination, time-point, or recipient here.

Checkpoint

Which particle correctly fills the blank in 私は毎朝コーヒー＿＿飲みます (“I drink coffee every morning”)?

Watch out

The に vs. で contrast trips up learners. Use に for a destination or existence point (家にいます, ie ni imasu, “[I] am at home”) but で for where an action is performed (家で食べます, ie de tabemasu, “[I] eat at home”). Ask: is this a target (に) or the stage for an action (で)?

Checkpoint

In 七時に東京に着きます (Shichi-ji ni Tōkyō ni tsukimasu, “[I] arrive in Tokyo at seven”), what two roles is に playing?

On the exam

Particle choice is graded in both writing and speaking. Build muscle memory by learning verbs together with the particle they take: 〜に行く (ni iku, “go to”), 〜を食べる (o taberu, “eat”), 〜で会う (de au, “meet at”). Storing verb + particle as a unit prevents most particle errors.

Answer the 2 checkpoints as you read.