Japanese grammar
What does ～ないと mean? Japanese grammar N3
～ないと means must…; have to… (contraction of ないといけない).
| Level (estimated, JLPT framework) | N3 |
|---|---|
| Structure | Vない + と、+ negative consequence Vない + と（いけない／だめだ） |
| Romaji | naito |
| Meaning | must…; have to… (contraction of ないといけない) |
Forming it
| Left unfinished | もう行かないと。 |
|---|---|
| Full clause after | 食べないと、お腹が空く |
How to use it
Two directions: (a) states a bad consequence if something isn't done; (b) leaves the sentence unfinished to say “must do” — colloquial.
- Direction (a): 「宿題をしないと、先生に怒られる」 — 「と」 states an inevitable consequence, so the clause after does NOT use volition or a request.
- Direction (b) is very common in conversation: 「もう行かないと」 (I have to go now) — the listener understands that the part 「いけない」 has been omitted.
- Same group of obligation meaning: 「なければならない」 (written), 「なきゃ／なくちゃ」 (colloquial).
Examples
宿題をしないと、先生に怒られるよ。
If you don't do your homework, the teacher will scold you.
時間がない。もう出かけないと。
There's no time. I have to head out now.
Keep in mind
- The second clause cannot be a command or invitation.
- The trailing-off form is only used in casual conversation.
Common mistakes
-
Wrong宿題をしないと、やってください。
If you haven't done your homework, go do it.
Correct宿題をしないと、先生に怒られます。
After 「と」, only an inevitable consequence is stated, not a request sentence.
-
Wrong（報告書に）早く決めないと。
It's necessary to decide soon.
Correct（報告書に）早く決めなければなりません。
The unfinished form is colloquial; formal writing must use 「なければならない」.
Exam tips
- 「ないと」 = if not… then trouble / must do (left unfinished); the clause after doesn't use a command.