Grammar detail: verb て form + はいけません

verb て form + はいけません  must not do
120 words
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verb て form
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.

You must not get off the train before it stops.
It is technically correct to use ては
けません, as this form is actually based on the potential form of
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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Kanji used in this grammar

コウ   ギョウ   アン   ゆ    い to go   おこな to take place   
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レツ    row   
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シャ   くるま car   
シ   とめる to stop   とまる to stop   
コウ   おりる to get off   おろす to drop off   ふ to fall (eg rain)   
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