べきではない means should not do; must not do; ought not to ~. It is a JLPT N3 grammar pattern used to state a prohibition, strong negative recommendation, or moral duty not to do something.
This grammar point often appears in neutral to formal Japanese. If you want to state a strong prohibition or negative moral obligation, べきではない is a useful pattern to learn.
What does べきではない mean?
Use べきではない when you want to state a prohibition, strong negative recommendation, or moral duty not to do something.
Natural translations include:
- should not do; must not do ~
- should not do; must not do; ought not to ~
- should not do; must not do
How to form べきではない
Verb dictionary form + べきではない (する \u2192 すべきではない)
Examples of the pattern:
- 行くべきではない
- 遅れるべきではない
- 忘れるべきではない
When is べきではない used?
Use べきではない in situations like:
- giving warnings
- stating ethical boundaries
- formal prohibitions
Tone and register:
- neutral to formal
- Common in giving warnings, test questions, and written narratives
べきではない example sentences
- 人を傷つけるべきではない。 \u2014 You should not hurt people.
- 約束を破るべきではない。 \u2014 You must not break promises.
- 先生に失礼なことを言うべきではない。 \u2014 You shouldn’t say rude things to your teacher.
- 自分の感情を無視するべきではない。 \u2014 You shouldn’t ignore your own feelings.
- そんなに心配するべきではないよ。 \u2014 You shouldn’t worry that much.
Nuance of べきではない
The key nuance is strong negative advice; implies violation of duty or principle if ignored.
This matters because \u301cべきではない feels like a statement of principle. It is stronger than \u301cないほうがいい and closer to ‘it is wrong to’ than ‘it would be better not to.’.
For example:
- In giving warnings, it sounds natural and specific.
- Compared with ないほうがいい, it carries a different weight and implication.
べきではない vs ないほうがいい
Both べきではない and ないほうがいい can express should not do, but they are different.
べきではない:
- states that an action is wrong or improper on principle; stronger and more absolute
ないほうがいい:
- recommends avoiding an action as a practical choice; softer and more advisory
Quick contrast examples:
- 遅刻すべきではない。 \u2014 You must not be late (it’s wrong).
- 遅刻しないほうがいい。 \u2014 You’d better not be late (advisory).
Common mistakes with べきではない
Watch out for these mistakes:
- Using it for personal preference when 〜ないほうがいい or 〜たくない is more appropriate
- Forgetting that this is the negative of 〜べきだ, not a casual ‘shouldn’t’
- Confusing the form: するべきではない and すべきではない are both fine, but don’t mix incorrectly
Is べきではない on the JLPT?
Yes. べきではない is commonly taught as JLPT N3 grammar.
That means learners should be able to:
- recognize it in reading
- understand its nuance in context
- use it in simple original sentences
Practice questions for べきではない
Try making your own sentences with these prompts:
- Say people shouldn’t tell lies.
- State that students should not be late.
- Advise that one shouldn’t ignore their health.
Learn べきではない with Kanjiru
If you want to review べきではない together with kanji, vocabulary, and other JLPT N3 patterns, Kanjiru helps you practice Japanese in short, focused sessions.
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