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May not A; must not A
Join for free or Login to study this and other grammar in the lesson て Verb Hooks!
ここ で ごみ を 捨すて て は いけない ！ 
You must not throw away trash here!
好
16点
試 食 品 を 全 部 食 べ て は いけない 。 
You mustn't eat all the sample foods.
好
13点
お 父 さ ん に 逆 ら っ て は いけない 。 
Don't go against your father.
好
17点
あんな 人 達 と 交 際 して は いけない 。 
Don't associate with such people.
好
10点
あの 男 を 信 用 して は いけない 。 
You shouldn't trust the man.
好
5点
二 度 と 私 に 嘘 を つ い て は いけない 。 
Never tell me a lie again.
好
3点
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
Genki I: Chapter 6
新完全マスター文法 N4: 第１部　６課
JLPT N4 / Intermediate: て Verb Hooks ①


User notes
好
0点

It becomes ちゃいけない,じゃいけない (a small correction from the note below)
3 years ago
まさむね123 - Level 1
好
2点

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
11 years ago
avatar くるるぎくん - Level 1

Discussion about this grammar
dfperfume
Years Studied: 1
Studying: JLPT 4級
Level: 1, 好 : 28
If my verb A is in negative, like 行けなくて, would it mean that one -must- go?
好
0点
13 years ago (Edited 13 years ago.)
avatar
マイコー
Site admin
 Level: 110, 好 : 6,634
Yep! Here's the official page for it: http://renshuu.org/index.php?page=grammar/individual&id=27
好
0点
13 years ago
dfperfume
Years Studied: 1
Studying: JLPT 4級
Level: 1, 好 : 28
Oh! I didn't know that there was! Sorry for the trouble Michael. I'll transfer my sentence there.

Thank you!
好
0点
13 years ago (Edited 13 years ago.)
arie
Level: 1, 好 : 6

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?.

好
0点
4 years ago
avatar
友人
Years Studied: 13
Level: 1, 好 : 947
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.
好
1点
4 years ago



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