conditional N3 common casualpolitewritten
〜でないと — if it isn't ~ / unless ~
〜でないと ・ でないと
Builds on である
Meaning
- unless it is ~ / if it isn't ~ (or else) — the negative copula on a と conditional, warning of an unwanted result
Key sentence
学生でないと、この割引は受けられない。
Unless you're a student, you can't get this discount.
Formation
| Attaches to | Form | Example |
|---|---|---|
| Noun / na-adjective | N / na-adj + でないと | 会員 → 会員でないと |
Examples
本物でないと、意味がない。
If it isn't the real thing, there's no point.
静かでないと、集中できない。
Unless it's quiet, I can't concentrate.
元気でないと、この仕事は務まらない。
You can't handle this job unless you're in good health.
When you can't use it
- Like the と conditional it's built on, でないと implies an automatic, often undesirable consequence — it carries an 'or else' warning tone. The main clause is typically something negative or a problem, not an invitation.
Easily confused with
〜と (conditional) でないと is the negative copula on the と conditional: 〜だと ('if it is ~') → 〜でないと ('if it isn't ~'). It keeps と's flavor of an inevitable result. 〜でなければ Both mean 'unless it is ~'. でないと is more colloquial and leans into the 'or else' warning; でなければ is neutral and works freely in writing and formal contexts.
See 〜でないと in real sentences
Jengo shows 〜でないと the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled with reference to A Dictionary of Advanced Japanese Grammar.