Japanese with Manga

Should not do with

Grammar: Prohibition » 〜てはいけない

〜てはいけない says that an action is forbidden or unacceptable: “must not” or “should not”.

Usage Notes

〜てはいけない tells the listener that doing the action is not acceptable, not that the speaker dislikes it.

In speech, ては contracts to ちゃ, producing forms like しちゃいけない.

Related Grammar

  • Must not do with 〜てはだめだ
    • Used to prohibit (rather than simply discourage) an action.
  • Must not do with 〜べからず
    • An old-fashioned way to strongly forbid an action.

Examples

Want to submit a manga example for this grammar?

Don't underestimate bread-baking with 〜てはいけない

Grammar Explanation: Should not do with 〜てはいけない

Manga panel from ご注文はうさぎですか？ showing example of Don't underestimate bread-baking with 〜てはいけない.
ご注文はうさぎですか？ » Volume 1 » Page 35

Cocoa prepares to teach her friends how to bake bread.

ココア:
「みんな　パン作(つく)りをなめちゃいけないよ！」
“Everyone, don't underestimate bread making!”
◯:
「少(すこ)しのミスが完成度(かんせいど)を左右(さゆう)する戦(たたか)いなんだよ！」
“This is a battle where even a small mistake affects the final result!”