Structure
Verb + べき + ではない
Verb + べき + じゃない
[い]Adjective + くある + べき + ではない
[い]Adjective + くある + べき + じゃない
[な]Adjective + である + べき + ではない
[な]Adjective + である + べき + じゃない
Noun + である + べき + ではない
Noun + である + べき + じゃない
Details
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Standard
Rare Kanji
可き
About べきではない
As an extension of the auxiliary verb べき, that is partnered with verbs to convey 'ought to do (A)', べきではない (or べきじゃない) highlights the opposite, and means 'ought not to (A)', 'should not (A)', or 'must not (A)'. Just like べき, it is quite strong, and implies that doing (A) would be considered improper/incorrect.
べきではない (or べきじゃない) will be paired with the plain (non-past) form of a verb.
Caution
As with all other structures that use では, は may be omitted. However, as the presence of は strengthens the ない, the overall phrase will sound a little bit weaker without it.
Fun Fact
The combination of する and べき is a rare grammatical exception in Japanese, in which two forms are both considered equally correct. Due to this, either するべき, or すべき may be used.
Antonyms
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Examples
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あなた一人だけで決める可きではない。
You should not decide alone.
腐っている食べ物を食べる可きではない。
You shouldn't eat food that is rotten.
禁煙場所では、タバコを吸う可きではない。
You should not smoke in places that are non-smoking.
大したことないよ。心配をする可きではない。
It's not important. You shouldn't worry about it.
人が嫌がることをする可きではない。
You should not do things people dislike.
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How to negate “べき”? (ie. “should not”)
JStackExchange
How to use べき
Maggie Sensei
べきではない
JLPTSensei
接続・意味・使い方・例文
にほんごの里
Offline
[AIAIJ] An Integrated Approach to Intermediate Japanese
Page 55
Tae Kim's Japanese Grammar Guide
Page 309
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