The particles を, に, and で cannot be matched one-to-one with English words such as at, in, to, or with. を first marks what an action directly affects. に often marks a time point, destination, location of existence, or recipient. で marks where an action happens or the means used. Start with the verb, then ask how the noun relates to it.
を: what does the action affect?
パンを食べます。／I eat bread.
本を読みます。／I read a book.
日本語を勉強します。／I study Japanese.
ドアを開けます。／I open the door.
English identifies the object largely through position after the verb. Japanese marks it explicitly with を, even though the typical order places it before the verb.
を with movement through or away from a place
With certain movement verbs, を marks a route or a place being left rather than an ordinary object.
公園を歩きます。／I walk through the park.
橋を渡ります。／I cross the bridge.
七時に家を出ます。／I leave home at seven.
次の駅で電車を降ります。／I get off the train at the next station.
Learn common combinations such as 家を出る and 電車を降りる as whole patterns. They show why “を equals direct object” is only a starting point.
に for a specific time
毎朝、六時半に起きます。／I get up at 6:30 every morning.
月曜日に会議があります。／There is a meeting on Monday.
七月二十日に日本へ行きます。／I will go to Japan on 20 July.
Clock times, dates, and days of the week commonly take に. Relative times and frequency words such as 今日, 明日, 昨日, and 毎日 normally do not: 明日、学校へ行きます.
に for a destination or arrival point
学校に行きます。／I go to school.
家に帰ります。／I return home.
駅に着きました。／I arrived at the station.
English uses to, home without a preposition, and at in these translations. Japanese uses に because all three nouns are endpoints. へ can also mark direction: 日本へ行きます emphasises movement towards Japan, while 日本に行きます treats Japan as the destination.
に for the location of existence
机の上に本があります。／There is a book on the desk.
教室に先生がいます。／There is a teacher in the classroom.
田中さんは事務所にいます。／Tanaka is in the office.
あります and います describe existence, not an intentional action. The location therefore takes に. Inanimate things normally use あります; people and animals use います.
に for a recipient, target, or purpose
先生に質問します。／I ask the teacher a question.
友達に本をあげました。／I gave my friend a book.
日本へ日本語を勉強しに行きます。／I am going to Japan to study Japanese.
The first two examples direct an action towards a person. The purpose pattern uses the ます-stem＋に行く: 勉強します becomes 勉強し, then 勉強しに行きます.
で for the location of an action
図書館で勉強します。／I study at the library.
レストランで昼ご飯を食べます。／I eat lunch at a restaurant.
公園で写真を撮りました。／I took photos in the park.
English “at” appears in both at the library and arrived at the station. Japanese separates an action setting with で from an arrival point with に.
| Existence with に | Action with で |
|---|---|
| 図書館に本があります。 | 図書館で本を読みます。 |
| 教室に学生がいます。 | 教室で学生が話しています。 |
| 公園に池があります。 | 公園で写真を撮ります。 |
で for transport, tools, and language
電車で会社へ行きます。／I go to work by train.
箸でご飯を食べます。／I eat with chopsticks.
日本語で話してください。／Please speak in Japanese.
スマートフォンで写真を撮ります。／I take photos with a smartphone.
で answers “by what means, with what tool, or in what language?” English changes the preposition, but Japanese keeps the same relationship marker. Walking uses the set て-form 歩いて: 駅まで歩いて行きます.
で for material, participants, and range
木で机を作ります。／I make a desk from wood.
三人で旅行します。／The three of us travel together.
この町で一番高い建物です。／It is the tallest building in this town.
These are not simply “action location” uses. で establishes the material, group, or range within which the statement applies.
Three contrasts to master first
| に | で | Difference |
|---|---|---|
| 学校に行きます | 学校で勉強します | Destination / action location |
| 部屋に猫がいます | 部屋で猫と遊びます | Existence / action location |
| 七時に起きます | 電車で行きます | Time point / means |
Decision order: find the verb. あります・います usually take に for location. 行きます・来ます・帰ります usually take に for the endpoint. A normal action takes で for its setting. The direct object takes を.
Build the sentence from the verb backwards
Instead of translating an English sentence word by word, begin with the Japanese verb and ask what it requires.
“I study Japanese at the library at seven.”
Verb: 勉強します.
What? 日本語を.
Where does the action happen? 図書館で.
When? 七時に.
七時に図書館で日本語を勉強します。
Japanese can rearrange some of those phrases, but the particles preserve their relationships. This method is more reliable than assigning one English preposition to each particle.
Common mistakes
- 学校に勉強します: studying is an action, so 学校で.
- 部屋で机があります: あります describes existence, so 部屋に.
- 毎日に勉強します: 毎日 normally has no に.
- 電車に会社へ行きます: the means is 電車で.
- パンに食べます: the object is パンを.
- Choosing by English “at” or “in” instead of the Japanese verb relationship.
Practice
- 図書館（に／で）本があります。
- 図書館（に／で）本（を／に）読みます。
- 七時（に／で）家（を／に）出ます。
- バス（に／で）学校（に／で）行きます。
- 先生（に／で）メール（を／に）送ります。
- 公園（を／に）歩きます。
- 日本語（に／で）質問してください。
- Translate: “I drink coffee at a cafe at nine.”
Answers: 1 に. 2 で, を. 3 に, を. 4 で, に. 5 に, を. 6 を. 7 で. 8 九時にカフェでコーヒーを飲みます。
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