〜間 (あいだ) / 〜間に: 'While' and 'During' in Japanese
What it means
Both 〜間 and 〜間に translate as "while" or "during," but they tell you different things about the second action. With 〜間 (no に), the second action continues for the whole stretch of time — two things happen in parallel from start to finish. With 〜間に, the second action is a single event that happens at one moment inside that stretch.
The word 間 (あいだ) literally means "interval" or "the space between." Think of 〜間 as filling the whole interval and 〜間に as marking one point inside it.
赤ちゃんが寝ている間、ヤッタンは本を読んでいた。
あかちゃんが ねている あいだ、ヤッタンは ほんを よんでいた。
While the baby was sleeping, Yattan was reading the whole time.
間 = reading lasted the entire nap.
赤ちゃんが寝ている間に、ヤッタンは買い物に行った。
あかちゃんが ねている あいだに、ヤッタンは かいものに いった。
While the baby was asleep, Yattan went shopping.
間に = one trip, at some point during the nap.
How to form it
間 attaches to the word in front of it the same way for both 間 and 間に. Just add に when you mean a one-time action inside the period.
| What comes before | Pattern | Example |
|---|---|---|
| Verb (continuous) | 〜ている + 間(に) | 食べている間 = while (someone) is eating |
| Verb (dictionary) | dict. + 間(に) | 日本にいる間 = while (I'm) in Japan |
| Noun | noun + の + 間(に) | 夏休みの間 = during summer vacation |
| い-adjective | 〜い + 間(に) | 若い間 = while (you're) young |
| な-adjective | 〜な + 間(に) | 元気な間 = while (you're) healthy |
The most common shape by far is 〜ている間(に) — a continuing state or action, because 間 needs a span of time to describe.
〜間 — the action lasts the whole time
Use plain 〜間 when the main clause continues across the entire period. A good clue: the main verb is often itself in 〜ている (a continuing action), and words like ずっと ("the whole time") fit naturally.
先生が話している間、モチはずっとメモを取っていた。
せんせいが はなしている あいだ、モチは ずっと メモを とっていた。
The whole time the teacher was talking, Mochi was taking notes.
Both actions run in parallel, start to finish.
日本にいる間、ヤッタンは毎日日本語を勉強した。
にほんに いる あいだ、ヤッタンは まいにち にほんごを べんきょうした。
While he was in Japan, Yattan studied Japanese every day.
A repeated action across the whole stay.
夏休みの間、弟は海の近くにいた。
なつやすみの あいだ、おとうとは うみの ちかくに いた。
During summer vacation, Yattan's little brother stayed near the sea.
Noun + の + 間: a state lasting the whole break.
〜間に — one action at some point inside
Use 〜間に when something happens once (or starts and finishes) at a moment within the period. This is the more common pattern in everyday speech.
先生が話している間に、モチは寝てしまった。
せんせいが はなしている あいだに、モチは ねて しまった。
At some point while the teacher was talking, Mochi fell asleep.
One sudden event inside the talk.
ヤッタンがいない間に、弟がケーキを全部食べた。
ヤッタンが いない あいだに、おとうとが ケーキを ぜんぶ たべた。
While Yattan was away, his little brother ate all the cake.
A single completed action during his absence.
若い間に、いろいろな所へ行きたい。
わかい あいだに、いろいろな ところへ いきたい。
While I'm young, I want to go to lots of places.
間に suits a goal to achieve within a window of time.
The minimal pair to remember
Same setup, one tiny に — and the meaning changes completely:
モチが料理する間、ヤッタンはテレビを見ていた。
モチが りょうりする あいだ、ヤッタンは テレビを みていた。
The whole time Mochi was cooking, Yattan was watching TV.
間: watching filled the entire cooking time.
モチが料理する間に、ヤッタンは電話をかけた。
モチが りょうりする あいだに、ヤッタンは でんわを かけた。
While Mochi was cooking, Yattan made a phone call.
間に: one quick call at some point during the cooking.
A simple test: if the second action could finish before the first one does, use 間に. If both run together to the end, use 間.
Common mistakes
- Using 間 when the action is a one-time event. "I went shopping while the baby slept" is a single trip, so it needs 間に: 寝ている間に買い物に行った. Plain 間 would wrongly mean "I shopped the entire nap."
- Forgetting that 間 wants a span. Pair it with a continuing state — usually 〜ている or a verb like いる. A momentary verb alone (落ちる間, "while it falls") sounds odd.
- Dropping の after a noun. It's 夏休みの間, not 夏休み間.
- Confusing 間 with 〜ながら. Use 〜ながら when one person does two things at once (歩きながら話す). Use 間 when two different situations overlap in time.
Quick recap
- 〜間 = the main action lasts the whole period (parallel, start to finish).
- 〜間に = a one-time action happens at some point inside the period.
- Attach to 〜ている / dictionary verb, noun + の, or an adjective.
- The に is the whole difference: 間 = continuous, 間に = a moment within.
Your turn
Choose 間 or 間に for each sentence.
Start the 5-question drill →Take the full N4 〜間 / 〜間に drill →
Frequently asked questions
What's the difference between 間 and 間に?
間 (no に) means the main action lasts the whole period — two things run in parallel. 間に means a single action happens at some point inside the period. 寝ている間 = reading the whole nap; 寝ている間に = went out once during the nap.
How do I attach 間 to a noun?
Use noun + の + 間: 夏休みの間 ('during summer vacation'), 授業の間 ('during class'). Don't drop the の.
When should I use 間に instead of 間?
Use 間に for a one-time, completed action — going out, making a call, falling asleep. A quick test: if the second action could finish before the first one ends, choose 間に.
Is 間 the same as 〜ながら?
No. 〜ながら is one person doing two actions at once (walking while talking). 間 connects two separate situations that overlap in time (while the teacher talked, Mochi took notes).