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Grammar detail: verb て form + はいけません

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JLPT:
verb て form + はいけません - must not do
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verb て form
+
はいけません
means
must not do something
Note that although in Japanese this is the inverse of 〜なくてはいけません, which means 'must do' or 'have to do', the English is not directly the inverse, which would be 'do not have to do'.
The plain form is 〜てはいけない, and the more informal version is 〜ちゃいけない.
DETAILS
れっしゃ
列車
が
と
止
まらないうちに
お
降
りてはいけない。
You must not get off the train before it stops.
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See also:
  • verb なくて form + はいけません - have to do

Kanji used in this grammar

列
レツ    row   
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車
シャ   くるま car   
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止
シ   とめる to stop   とまる to stop   
2
降
コウ   おりる to get off   おろす to drop off   ふる to fall (eg rain)   
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3
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