Meaning & Usage
Use 間に (ma ni) to describe an action that happens within a specific "time window." It marks an event that starts and finishes while a certain state or background action is still ongoing. In English, this is usually translated as "while" or "during."
The first part of your sentence (Clause A) sets the duration of the window. The second part (Clause B) describes a specific event that occurs inside that timeframe. This event is typically a momentary or completed action, not something that lasts for the whole duration of Clause A. If the action in Clause B lasted the entire time, you would drop the に and just use 間.
Think of it like placing a single dot on a timeline. The line is the continuous state (Clause A), and the dot is your specific action (Clause B). This grammar often implies a sense of timing or opportunity—doing something before the situation changes.
Structure & Formation
間に is quite flexible and connects to various parts of speech. Use the following patterns to form your sentences:
| Category | Formation | Example |
|---|---|---|
| Verbs | Dictionary / ている / ない + 間に | 忘れない + 間に |
| Nouns | Noun + の + 間に | 昼休み + の + 間に |
| い-Adjectives | い-Adj + 間に | 明るい + 間に |
| な-Adjectives | な-Adj + な + 間に | 元気な + な + 間に |
The ～ている form is most common for verbs because it emphasizes an ongoing state. Use the ない form to express "while something has not yet happened" (e.g., "while it is not raining").
Example Sentences
1. Using Verbs
子供が寝ている間に、手紙を書きました。
kodomo ga neteiru ma ni, tegami wo kakimashita.
I wrote a letter while the children were sleeping.
日本にいる間に、たくさんの寺を見たいです。
nihon ni iru ma ni, takusan no tera wo mitai desu.
I want to see many temples while I am in Japan.
忘れない間に、メモをしてください。
wasurenai ma ni, memo wo shite kudasai.
Please take a memo while you haven't forgotten (before you forget).
2. Using Nouns
夏休みの間に、運転免許を取りました。
natsuyasumi no ma ni, unten menkyo wo torimashita.
I got my driver's license during the summer vacation.
留守の間に、泥棒が入りました。
rusu no ma ni, dorobou ga hairimashita.
A thief broke in while I was away from home.
3. Using Adjectives
若い間に、いろいろな経験をしたいです。
wakai ma ni, iroiro na keiken wo shitai desu.
I want to have various experiences while I am young.
スープが温かい間に、飲んでください。
suupu ga atatakai ma ni, nonde kudasai.
Please drink the soup while it is still warm.
Common Mistakes
Mistake 1: Confusing 間 (Duration) and 間に (Specific Point)
❌ 寝ている間に、ずっと雨が降っていました。
✅ 寝ている間、ずっと雨が降っていました。
Use 間 (no に) when the action in the second part lasts for the entire duration of the first part. Use 間に only for an action that happens and finishes inside that timeframe.
Mistake 2: Missing 'no' with Nouns
❌ 昼休み間に、銀行へ行きました。
✅ 昼休みの間に、銀行へ行きました。
Just like standard noun modification, you must include the possessive particle の between a noun and 間.
Cultural Notes & Nuance
In daily life, Japanese speakers use 間に to highlight efficiency or timing. For example, parents might say 子供が寝ている間に (while the kids are asleep) to explain a quick coffee break or finishing chores. It emphasizes that they are taking advantage of a quiet moment before it ends.
In business, you may hear 部長がいらっしゃらない間に (while the manager is out). This shows an awareness of the current situation and the need to act during that specific window of time.
Related Grammar Points
- Sequence and Starting Points: Using てから (te kara) (Grammar N4)
- Bakari (ばかり) — Just Did, Nothing But (Grammar N4)
- ように (You ni) — So That, In Order To (Grammar N4)
- Understanding はずだ: Expressing Logical Expectations (Grammar N4)
- Substitution & Trade-offs: kawari ni (Grammar N4)
- The Grammar of Appearance: Using ～そうだ (Grammar N4)
JLPT Tips
On the N4 exam, the most common trap is choosing between 間 and 間に. Look at the verb in the second clause. If you see words like ずっと (all the time) or verbs describing long states, pick 間. If you see momentary verbs like 始まる (start), 来る (come), or 作る (make), pick 間に.
Also, remember that 間に requires a duration. You cannot use it with specific clock times like "3 o'clock." Use までに if you want to say "by 3:00."