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May not A; must not A
ここ で ごみ を 捨すて て は いけない ！ 
You must not throw away trash here!
26
試 食 品 を 全 部 食 べ て は いけない 。 
You mustn't eat all the sample foods.
24
お 父 さ ん に 逆 ら っ て は いけない 。 
Don't go against your father.
24
あ ん な 人 た ち と 交 際 して は いけない 。 
Don't associate with such people.
17
あの 男 を 信 用 して は いけない 。 
You shouldn't trust the man.
15
二 度 と 私 に 嘘 を つ い て は いけない 。 
Never tell me a lie again.
9
あ ん な 男 に 負 け て は いけない 。 
Don't go down before such a man.

Getting the sentences
Construction
(Elements in parentheses are optional.)
AVerb: て-form
は
いけない/いけません
Basic Examples:
飲んではいけない (must not drink)

Related Expressions
なくてはいけない/ならない
はいけない
Where this grammar is found


Grammar usage notes

can also be ちゃいけない
and じゃういけない for de ha

also there are various endings
such as
あかん・いけん＆だめ
0
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It becomes ちゃいけない,じゃいけない (a small correction from the note below)
0
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まさむね123
Level: 1

Questions/Discussion

Nothing posted yet!

Discussion about this grammar
This section has been archived, and no new posts can be added. Please use the discussion form(s) above.
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dfperfume
Level: 1
If my verb A is in negative, like 行けなくて, would it mean that one -must- go?
0
16 years ago
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マイコー
Level: 292
Yep! Here's the official page for it: http://renshuu.org/index.php?page=grammar/individual&id=27
0
16 years ago
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dfperfume
Level: 1
Oh! I didn't know that there was! Sorry for the trouble Michael. I'll transfer my sentence there.

Thank you!
0
16 years ago
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arie
Level: 1

I cannot find a separate grammar point about "だめ" (てはだめ), it's only vaguely mentioned here in a grammar note. As I understand it, it is used with similar meaning as this one. Can someone explain the difference to me if there is any?.

0
7 years ago
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友人
Level: 1
だめ isn't really a grammar point, it's a vocabulary term. ikenai is, literally, "it won't go", "it won't do"; something that won't work, that someone shouldn't do (or with a negative verb, something someone shouldn't NOT do.). だめ literally means "burdensome to the eye"; something that is of no use, if not troublesome, problematic. They overlap when referring to something that shouldn't be undertaken. 無理 kind of hits the same idea only stronger, as in "unthinkable" Hope this helps.
2
7 years ago
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