The Japanese Particle Wo: Object, Path, Departure

を (wo) is the particle every beginner learns first and understands least. Its textbook definition is "direct object marker", which is true about 70 percent of the time. The other 30 percent is where learners get stuck, because を also marks the space you move through and the place you leave — and in both of those jobs the verb is not acting on anything at all.

• ご飯を食べます (gohan wo tabemasu, "I eat a meal") — object
• 道を歩きます (michi wo arukimasu, "I walk along the road") — path
• 家を出ます (ie wo demasu, "I leave the house") — departure

Three sentences, one particle, three completely different relationships. English uses three different prepositions for these ("eat the meal", "walk along the road", "leave the house"), which is why を feels slippery to an English speaker and obvious to a Japanese one.

を typing note

を is pronounced "o" but typed wo. If you type o in most IMEs you will get お instead, or a list of candidates — so type wo and be done with it. When you practise on a romaji keyboard, the keystrokes are w then o, and the を appears. It is the only kana in the language that is pronounced differently from how it is typed, unless you count the particles は and へ.

Job 1: the direct object

This is the one you already know. The verb acts on the noun.

• 本を読みます (hon wo yomimasu, "I read a book")
• 日本語を勉強します (nihongo wo benkyou shimasu, "I study Japanese")
• 音楽を聞きます (ongaku wo kikimasu, "I listen to music")
• 写真を撮ります (shashin wo torimasu, "I take a photo")
• コーヒーを飲みます (koohii wo nomimasu, "I drink coffee")

The test is whether the verb does something to the noun. 食べる (taberu, "eat"), 読む (yomu, "read"), 見る (miru, "see"), 買う (kau, "buy"), 書く (kaku, "write"), 作る (tsukuru, "make") — these are transitive verbs, and their object takes を.

Note that the English verb does not have to be transitive for the Japanese one to be. "I listen to music" has "to" in English; 音楽を聞きます has を. "I wait for a friend" is 友達を待ちます (tomodachi wo machimasu) — 待つ (matsu, "wait") takes a direct object in Japanese.

Job 2: the path you move through

This is the job nobody warns you about. Japanese verbs of motion that describe travelling across or along a space take を for that space.

• 道を歩きます (michi wo arukimasu, "I walk along the road")
• 公園を散歩します (kouen wo sanpo shimasu, "I stroll through the park")
• 橋を渡ります (hashi wo watarimasu, "I cross the bridge")
• 空を飛びます (sora wo tobimasu, "I fly through the sky")
• 海を泳ぎます (umi wo oyogimasu, "I swim in the sea")
• 角を曲がります (kado wo magarimasu, "I turn the corner")
• 道を横切ります (michi wo yokogirimasu, "I cross the street")

What unites these verbs — 歩く (aruku, "walk"), 走る (hashiru, "run"), 渡る (wataru, "cross"), 飛ぶ (tobu, "fly"), 泳ぐ (oyogu, "swim"), 曲がる (magaru, "turn"), 通る (tooru, "pass through") — is that the space is not a stage where something happens, it is the route being traced. The verb does not act on the road; the road is what you travel along.

Because these verbs are grammatically intransitive in Japanese, this is a genuinely confusing point: an intransitive verb taking an object-looking particle. It is not an object. Think of を here as meaning "along", "through", "across", or "around".

A subtle but real difference: 公園を歩きます (kouen wo arukimasu) means walking through the park as a route. 公園で歩きます (kouen de arukimasu) means walking around inside the park, treating it as the place where the activity of walking happens — the way you would say "I walk in the park" as exercise. Both are possible; を makes the park a path, で makes it a location.

Job 3: the place you leave

The third job is the mirror image of the second. Verbs of leaving and departing take を for the place being left.

• 家を出ます (ie wo demasu, "I leave the house")
• 七時に家を出ます (shichi ji ni ie wo demasu, "I leave home at seven")
• 大学を卒業します (daigaku wo sotsugyou shimasu, "I graduate from university")
• 電車を降ります (densha wo orimasu, "I get off the train")
• 席を立ちます (seki wo tachimasu, "I leave my seat")
• 国を離れます (kuni wo hanaremasu, "I leave the country")

The verbs are 出る (deru, "exit"), 卒業する (sotsugyou suru, "graduate"), 降りる (oriru, "get off"), 立つ (tatsu, "stand up" — 席を立つ means to stand up from a seat), 離れる (hanareru, "separate from"), 出発する (shuppatsu suru, "depart").

The logic is consistent with job 2: を marks the space the movement passes along, and leaving a place means passing out of it.

The same place, three particles

Take one noun — 学校 (gakkou, "school") — and watch the verb choose the particle.

This is the single most useful table on the page. Whenever you are unsure, ask what the verb is doing with the place: going to it, acting in it, or leaving it.

を with する verbs

A large family of Japanese verbs is built by adding する (suru, "do") to a noun: 勉強する (benkyou suru, "study"), 掃除する (souji suru, "clean"), 洗濯する (sentaku suru, "do laundry"), 散歩する (sanpo suru, "take a walk"), 料理する (ryouri suru, "cook").

These verbs are already transitive, so the thing being studied or cleaned takes を:

• 日本語を勉強します (nihongo wo benkyou shimasu, "I study Japanese")
• 部屋を掃除します (heya wo souji shimasu, "I clean the room")

You will also meet a version with を inserted before する: 日本語の勉強をします (nihongo no benkyou wo shimasu, literally "I do the studying of Japanese"). Both are correct and mean the same thing. The plain 日本語を勉強します is more common in everyday speech; the の plus をします form sounds slightly more explicit or formal, and it is handy when you want to modify the noun — 毎日、日本語の勉強をしています (mainichi, nihongo no benkyou wo shite imasu, "I study Japanese every day").

Note that the する-verb route lets a noun take を even when the noun itself is not the thing being acted on. 散歩します (sanpo shimasu, "take a walk") needs no object at all, but 公園を散歩します (kouen wo sanpo shimasu) uses を in its path sense from earlier: 公園 is the route, and the walk happens along it.

Where を cannot go

Two restrictions trip people up.

を does not combine with は. If you want to make the object a contrastive topic, を disappears:

• ご飯は食べません (gohan wa tabemasen, "I don't eat rice") — not ご飯をは
• この本は読みました (kono hon wa yomimashita, "I did read this book") — not この本をは

も replaces を as well, in modern spoken Japanese:

• 水も飲みました (mizu mo nomimashita, "I drank water too")

You will see をも in older and formal writing, and in the set phrase 〜をもって (wo motte, "by means of"), but do not build sentences with it in conversation.

を with verbs that also take に

Some verbs can go either way, and the meaning shifts with the particle.

• 先生に聞きます (sensei ni kikimasu, "I ask the teacher") — に marks the person asked
• 音楽を聞きます (ongaku wo kikimasu, "I listen to music") — を marks the thing heard

聞く (kiku) means both "ask" and "listen", and the particle is what tells you which one. 教える (oshieru, "teach") works the same way: 学生に英語を教えます (gakusei ni eigo wo oshiemasu, "I teach English to students") — に for the person, を for the subject matter. A single sentence can carry both.

Common mistakes for English speakers

Assuming を always means "object". This is the mistake that costs the most in reading. When you hit 道を歩く (michi wo aruku) and your brain says "the road is being walked", the sentence stops making sense. Train yourself to read を as "along / through" when the verb is a movement verb.

Using に for leaving. 家に出ます (ie ni demasu) is wrong. 出る takes を: 家を出ます. The direction particle に is for going to a place, not away from it.

Using で for a path. 道で歩きます (michi de arukimasu) is not what you want when the road is your route. Use を: 道を歩きます. Save で for "I walk around in the street" as a location.

Writing をは. There is no such combination. Drop the を and use は on the noun.

Using を with 好き, 分かる, or できる. These take が, not を: 日本語が分かります (nihongo ga wakarimasu, "I understand Japanese"), 音楽が好きです (ongaku ga suki desu, "I like music"). They describe a state, not an action on an object.

Typing o and getting お. Type wo for を. It is one extra keystroke and it removes an entire class of typos.

Forgetting を when the sentence is long. In a sentence like 昨日、駅の近くの本屋で日本語の本を三冊買いました (kinou, eki no chikaku no hon'ya de nihongo no hon wo sansatsu kaimashita, "yesterday I bought three Japanese books at the bookstore near the station"), the を sits far from the verb. The particle still has to be there, and it is still marking 本.

Where this fits

を is one of the six particles that hold Japanese sentences together. The overview is in the particles guide; its two closest neighbours in meaning are covered in ni vs de and e vs ni. If the object-versus-topic distinction still feels shaky, read wa vs ga first — it explains why を sometimes has to disappear.

Path を is the kind of thing you can read about for an hour and still not use. You have to meet 道を歩く (michi wo aruku) in a sentence, type it, and let it sit. Practice mode feeds you those sentences whole, with every particle marked, so を stops being "the object particle" and starts being three particles you recognise on sight. Not confident on the kana yet? The kana tables are the right warm-up, and the romaji converter will show you exactly how any sentence types out.