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Grammar detail: verb て form + はいけません

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5
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.
It is technically correct to use ては
い
行
けません, as this form is actually based on the potential form of
い
行
く (you could think of the literal translation as 'cannot go (if ~)'). However, this is very uncommon in practice - in modern Japanese it is customary to write auxiliary and compound forms with kana. For more on this issue see using kanji or kana for grammar
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See also:

Kanji used in this grammar

行
コウ   ギョウ   アン   ゆく    いく to go   おこなう to take place   
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1
列
レツ    row   
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3
車
シャ   くるま car   
1
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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