Translation guide
The English word "in" is a preposition with many uses. This guide covers the most common ways to express location, time, state, and other meanings in Japanese, focusing on natural patterns rather than direct translation.
Expressing that something is physically inside a container, room, building, or other enclosed area.
Use の中 (no naka) meaning "inside" followed by に (ni) for location. This is the most direct way to say "in" for containers and enclosed spaces.
箱の中に猫がいます。
There is a cat in the box.
冷蔵庫の中にビールがある。
There's beer in the fridge.
For larger locations like cities, countries, or buildings, に alone often suffices. の中に would be overly specific.
東京に住んでいます。
I live in Tokyo.
図書館に本を返した。
I returned the book at the library. (lit. in the library)
Use の中で (no naka de) when an action takes place inside a location. The particle で marks the location of an action.
部屋の中で遊んでいる。
They are playing in the room.
Indicating presence or action at a specific place like a station, store, or event.
For static location (being somewhere), use に.
駅にいる。
I'm at the station. (lit. in the station)
For actions happening at a place, use で.
Expressing that something happens within a time frame like morning, a month, or a year.
Use に after specific time expressions like days, dates, months, years, and times of day (except relative times like 今日).
朝にコーヒーを飲む。
I drink coffee in the morning.
2020年に日本に来た。
I came to Japan in 2020.
Expressing that something will happen after a certain amount of time has passed.
Use 後で (ato de) or 後に (ato ni) meaning "after". 後で is more common in casual speech.
10分後に出発します。
We will depart in 10 minutes.
一時間後で大丈夫？
Is it okay in an hour?
Expressing the means by which something is done, such as language, writing instrument, or material.
Use で to indicate the means or instrument.
日本語で話してください。
Please speak in Japanese.
ペンで書いた。
I wrote it in pen.
Describing being in a particular state, mood, or situation.
Use の中 (no naka) for abstract states like "in trouble" or 状態 (joutai) for "in a state of".
彼は今、困難の中にいる。
He is in difficulty now.
混乱状態で仕事ができない。
I can't work in this state of confusion.
Describing what someone is wearing.
Japanese uses specific verbs for wearing items: 着る (kiru) for upper body, 履く (haku) for lower body, する (suru) for accessories. The pattern is [item] を [verb] ている.
彼は青いシャツを着ている。
He is in a blue shirt.
彼女は赤いスカートを履いている。
She is in a red skirt.
Indicating that something is part of a group or category.
Use の中に (no naka ni) for being among a group, or の一員 (no ichiin) for membership.
彼はチームの中にいる。
He is in the team.
私はクラブの一員です。
I am in the club.
English "in" maps to many different Japanese particles and patterns. Using に for everything will sound unnatural. Pay attention to whether you're describing location, time, means, or state.
に marks the location where something exists (static). で marks the location where an action takes place. Compare: 部屋にいる (I'm in the room) vs 部屋で寝る (I sleep in the room).
In casual speech, に is often omitted after time words like 朝 (asa) or 来年 (rainen). 朝コーヒーを飲む is perfectly natural.
I met a friend at the station.
For relative time words like 今日 (kyou, today), 明日 (ashita, tomorrow), 来週 (raishuu, next week), no particle is needed.
今日、映画を見る。
I'll watch a movie today. (lit. in today)
Use 中に (juu ni) to mean "within" a period, emphasizing the entire duration or a deadline.
今週中に終わらせる。
I'll finish it within this week.
A conditional form that can imply "in" when talking about future time. More colloquial.
5分したら戻る。
I'll be back in 5 minutes.
For some set phrases, で alone can indicate state.
急いでいるので、後にしてください。
I'm in a hurry, so please do it later.
I'll be there in a minute.
Time: often expressed with すぐに (immediately) rather than literal 'in'