てはいけない is used in Japanese to express that (A) 'cannot', or 'must not' be done. It is the combination of a verb in て form, the は particle, and the negative potential form of 行く (to be able to go). In this way, it literally means '(A) cannot/is not able to go'.
Although は can be dropped from many phrases and expressions, the は in this particular grammar point is usually not. This is because いけない would then become the second action in a sequence of events (the usual function of て form). However, to make this more casual, ては is often changed to ちゃ (ては becomes ちゃ), or じゃ (では becomes じゃ), as this is easier to say.
Caution
Apart from いけない; ならない and だめ are also frequently used to get across the same meaning. However, they are used in different situations.
いけない - Fairly neutral. Used in both spoken and written language.
ならない - Fairly formal. Used mostly in written language.
だめ - Very casual. Used almost exclusively in spoken language.
Antonymes
Contenu lié
Exemples
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そこに入ってはいけない。
Tu ne dois pas entrer là.
クジラを食べてはいけない。
Nous ne devons pas manger de la baleine.
このビルに入ってはいけない。
Tu ne dois pas entrer dans ce bâtiment.
晩ごはんの前に、お菓子を食べてはいけない。
Tu ne dois pas manger de bonbons avant le dîner.
この池で泳いではいけません。
Tu ne dois pas nager dans cet étang.
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The bunpro description states this contains “negative potential form of 行く”, however I’ve just encountered this:
Alphaz
In sentence 1 of this point - そこに入ってはいけない。
I keep failing by inputting ては instead of っては. Could someone explain me, why is it っては in this specific sentence? Is this some conjugation rule of previous grammar point, and if so then could you guide me towards it, so I can read about it a bit more?
IcyIceBear
When it says verb(て) it’s looking for the て form of the verb. 入る is a godan verb, not ichidan. So it’s て form is 入って
This point includes the て forms for all endings
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