The particle を

N を N o Marks the object of a verb

を (o) marks the thing that the verb acts on: the water you drink, the book you read. It does the job that word order does in English.

Level: JLPT N5, beginner
Type: Particles
English links: word order, transitive verbs, verb + preposition

What it means

を marks the object of the verb. That is the thing that the action happens to. In 水を飲みます (I drink water), the water is what gets drunk, so it takes を.

It is written with the old character を, but you say it "o", the same as お. You will hear some students say "wo". That is fine for spelling it out, but no one says it that way in a sentence.

Here is the big idea for us as English teachers. English shows the object by its place: after the verb. Japanese shows it with を, so the words can move around and the meaning stays the same. Your students grew up with a language where the label does the work, not the position.

How to build it

Pattern	How it works
Noun + を + verb noun + o + verb	The object comes before the verb. The verb ends the sentence.
Person は + noun + を + verb person wa + noun + o + verb	The usual order: topic, object, verb.
Place + を + movement verb place + o + movement verb	With 歩く, 渡る and 出る, を marks the place you move through or leave.

Examples

水を飲みます。 mizu o nomimasu. I drink water.
毎朝新聞を読みます。 maiasa shinbun o yomimasu. I read the newspaper every morning.
先生は英語を教えています。 sensei wa eigo o oshiete imasu. The teacher teaches English.
昨日、映画を見ました。 kinou, eiga o mimashita. I watched a film yesterday.
公園を歩きます。 kouen o arukimasu. I walk through the park.

How English says it

English has no word for を. The object simply comes after the verb: "I drink water". Move it and the sentence breaks, or the meaning changes. "The dog bit the man" and "The man bit the dog" use the same words.

So the English lesson behind を is word order. Subject, then verb, then object. Japanese is subject, object, verb, and the particle holds it all together.

Why it can make English hard

Japanese puts the verb last, so many beginners hold the verb back in English too, or drop it when the sentence gets long.
Because を labels the object, Japanese word order is free. Students do not always feel that English order carries meaning, so they move words around for emphasis and the meaning shifts.
Some verbs take を in Japanese but a preposition in English, and the other way round. 公園を歩く is "walk through the park", and 電話をかける is "call someone", with no "to".

Mistakes you will hear

I water drink. I drink water. The Japanese order, object before verb. Common in the first year.
English I like. I like English. The student puts the topic first, as in 英語は好きです. Fine in Japanese, odd in neutral English.
I listen music. I listen to music. 音楽を聞く has を and no preposition, so "to" goes missing.

In the classroom

Write a short sentence on cards, one word per card. Students build the English sentence in a line on the board. Then shuffle the Japanese version and show that the meaning holds, because of を.
Draw an arrow from the verb to the object in both languages. In English it points right; in Japanese it points left. A quick picture saves a long explanation.
Keep a list of "を in Japanese, preposition in English" verbs: listen to, look at, wait for, walk through. Add to it as you meet them in class.

Practice

Try each one, then open it to check.

1. Fill the gap: パン＿食べます。 (I eat bread.)

Answer: を

Bread is what gets eaten, so it is the object.
2. Fill the gap: 駅＿行きます。 (I go to the station.)

Answer: に (or へ)

The station is where you go, not the thing you act on. Use に or へ for a destination.
3. A student writes "I every day coffee drink." Fix it.

Answer: I drink coffee every day.

English needs subject, verb, object. The time phrase goes at the end.
4. Translate: 本を読みます。

Answer: I read a book. (or: I read books.)

Japanese has no article and no plural here. The English must choose a book, the book or books from the context.