TAKOBOTO

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てはいけない
Meaning
you shouldn't, one should not
美術館で写真を撮ってはいけない。/You shouldn't take picture in the museum.
Edit  赤毛
Formation
Phrases
どうぶつをいじめてはいけません。
One must not harass the animals.
Edit  #6767 赤毛
ここでたばこをすうってはいけません。きんえんですから。
You are not allowed to smoke here, because this is a no-smoke area.
Edit  #6768 赤毛
おさけをのんではいけません。
You are not allowed to drink alcohol.
Edit  #6777 赤毛
ここにじてんしゃをとめてはいけない。
It is forbidden to park bicycles here.
Edit  #6778 赤毛
「あなたはしおからいものをたべてはいけないよ」といったけど、かれはたべものにたくさんのしおをくわえた。
Although I told him "You're not allowed to eat salty!" he added a lot of salt in his food.
Edit  #7775 kitakaze
びじゅつかんでしゃしんをとってはいけない。
Please refrain from taking pictures in the museum.
Edit  #6766 赤毛
そのこきゃくにおうたいしてこれいじょうじかんをむだにしてはいけない。
Don't waste any more time responding to that customer.
Edit  #6770 dbx
ほかのひとのたすけをあてにしてはいけない。
You shouldn't count on others for help.
Edit  #6771 dbx
ドアをあけっぱなしにしてはいけません。
Don't leave the door open.
Edit  #6772 dbx
がいけんはあまりあてにしてはいけない。
You must not rely too much on appearance.
Edit  #6773 dbx
きんきゅうのばあいいがいはわたしのえんじょをあてにしてはいけません。
Don't look to me for any help except in case of emergency.
Edit  #6774 dbx
きみはしっぱいをふうんのせいにしてはいけない。
Don't set your failure down to bad luck.
Edit  #6775 dbx
きみはものごとをちゅうとはんぱにしてはいけないよ。
You shouldn't do things by halves.
Edit  #6776 dbx
「せんせい、ここであそんでもいいですか。」「いいえ、[あそんでは]いけません。」
- Teacher, is it okay to play here? - No, you cannot .
Edit  #6769 赤毛
Discussion and comments
Gerund form (Vて形) + は + いけない
Gerund form (Vて形) + は + いけません
Doing that, it cannot work. => You should not do that.
赤毛
This entry has a typo in it. Clearly the "形" is not part of the entry (unless it is completely silent. )
I suspect that the "形" in "Gerund form (Vて形)" was made part of the entry by mistake.
Kurt Schmucker
Technically 行けない is as ok as is いけない. But since it is part of a grammatical structure, the "directed walking" aspect of 行 is unpreferable, thus Hiragana-form is found more often.
adnim
...?
て形 means te-form, so it doesn't seem to be a typo. Unless I'm missing something here.
ochacha