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Must do A; have to A
好
12点
主 人 の 枕 は 臭 い ので 毎 日 洗 濯 しなくて は いけない 。 
Since my husband's pillow is really smelly, I have to wash it every day.
好
9点
何 で 僕 が やらなくちゃ いけない の 。 
Why do I have to do that?
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8点
だけど 、 明日 は お 客 さ ん と も 会わなくちゃいけない し ・・・ 。 
But I have an appointment with my client tomorrow.
好
17点
あなた は もっと 文 法 を 勉 強 し なくてはいけない 。 
You must study grammar more.
好
7点
あなた は 、 すぐ そこ に 行 か な く て は いけない 。 
You need to go there immediately.
好
5点
何 で こんなに 早 く 起 き な き ゃ いけない の ？ 
Why do I have to wake up this early?

Getting the sentences
Construction
(Elements in parentheses are optional.)
AVerb: ない form
-い
くては
いけない/いけません
Basic Examples:
いかなくてはいけない (must go)

AVerb: ない form
-い
くちゃ
いけない
Basic Examples:
寝なくちゃいけない (must sleep)

AVerb: ない form
-い
くては
ならない
Notes
Stronger than ~なければならない.
Related Expressions
てはいけない
Where this grammar is found
Genki I: Chapter 12
Nihongo So-Matome N4 (日本語総まとめ): 第２週　１日目
JLPT N4 / Intermediate: Grammar for Jumble Quizzes


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Discussion about this grammar
aileen
Studying: JLPT 2級
Level: 1, 好 : 67
The kanji for せんたく are incorrect in the example sentence. It should be 洗濯, not 選択. (:
好
2点
13 years ago
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マイコー
Site admin
 Level: 110, 好 : 6,629
Fixed, thanks.
好
0点
13 years ago
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grstar85
Years Studied: 3
Studying: JLPT2
Level: 1, 好 : 25
I have recently heard this with the more polite ikemasen instead of ikenai.
shinakutewa ikemasen - must do it
好
1点
12 years ago
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マイコー
Site admin
 Level: 110, 好 : 6,629
Thanks - I went ahead and added that to the non-contracted form given above.
好
0点
12 years ago
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mysticfive
Years Studied: since 2000
Studying: 自分のため、日本語教師だから
Level: 912, 好 : 4,997
in the Baic Construction, what is the bit with the VE/10?
好
1点
11 years ago
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マイコー
Site admin
 Level: 110, 好 : 6,629
What VE/10?? (fixed!)
好
0点
11 years ago
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katsukia8
Years Studied: 4
Studying: JLPT 5
Level: 1, 好 : 50
Is
好
0点
11 years ago
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マイコー
Site admin
 Level: 110, 好 : 6,629
??
好
0点
11 years ago
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くるるぎくん
Years Studied: 11 months
Studying: This site
Level: 1, 好 : 360
Ive never really thought about it. is there a way to make this form in the past
such as "i had to go"
好
0点
11 years ago
avatar
mysticfive
Years Studied: since 2000
Studying: 自分のため、日本語教師だから
Level: 912, 好 : 4,997
just like making a negative into the past tense - just drop the い and add かった - so "I had to go" would be 行かなくてはいけなかった
好
4点
11 years ago
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くるるぎくん
Years Studied: 11 months
Studying: This site
Level: 1, 好 : 360
thank you soo much.... sad to know ive been speaking this language forever and never...thought about this
好
0点
11 years ago
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テリフン
Years Studied: 3
Studying: ＪＬＰＴ　Ｎ3
Level: 1, 好 : 286
So, using くちゃ instead of くては　is more casual, right? Also, I am sorry, I know this is a terrible question, but the は is pronounced as it would be as a particle, correct? Wa, instead of Ha? Also, I have seen people write いけません as well as いけないです。Are both correct?
好
0点
10 years ago (Edited 10 years ago.)
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mysticfive
Years Studied: since 2000
Studying: 自分のため、日本語教師だから
Level: 912, 好 : 4,997
くちゃ is more casual than くては, and yes, the は is pronounced わ there because it *is* a particle - literally this pattern is a double negative (you can't not do such-and-such) so it might be easier to think of it as なくて　は　いけません. いけません and いけないです are both correct, but the former is slightly more formal.
好
6点
10 years ago
tkalee
Level: 1, 好 : 0
Is くちゃ seen as more feminine? I seem to recall there's a version of this that is childish/girlish, perhaps くちゃう？
好
0点
8 years ago
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マイコー
Site admin
 Level: 110, 好 : 6,629
I don't think I've heard females using it more than males, but someone else might have a differing view.
好
2点
8 years ago
まさむね123
Years Studied: Since Nov 2018
Studying: JLPT N3
Level: 1, 好 : 17

based on this https://japanesetest4you.com/f... we can also use 

くてはならない ? any thoughts? 
好
1点
4 years ago
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マイコー
Site admin
 Level: 110, 好 : 6,629
Added it, thanks! Already had the てはならない on another page on the site, so it only makes sense to add this one as well.
好
1点
4 years ago
まさむね123
Years Studied: Since Nov 2018
Studying: JLPT N3
Level: 1, 好 : 17
石油は現代の工業にとってなくてはならない原料である。
Oil is an essential raw material for modern industry.

Does anybody have a better guess on how to translate this sentence? It currently doesn't have an entry in here.
let me know if I should transfer this inquiry.
好
0点
3 years ago
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マイコー
Site admin
 Level: 110, 好 : 6,629
essential sounds good to me! It does *kind of fit* if you think of it this way:

食べなくてはならない = we cannot have the situation where there is no eating = we must eat
なくてはならない = we cannot have the situation where there isn't (ない) = we must have it
好
1点
3 years ago
まさむね123
Years Studied: Since Nov 2018
Studying: JLPT N3
Level: 1, 好 : 17
Thanks, that clarifies things up!
好
0点
3 years ago
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ミチャミチ
Level: 2, 好 : 3

漢字を練習しなくてはいけない

Is ないといけない relevant or not?

好
0点
2 years ago
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マイコー
Site admin
 Level: 110, 好 : 6,629

That works as well! There are several phrases that are almost the same.

しないといけない

しなければならない

しないと

しなくてはいけない

I'm sure I'm missing a couple more..

好
0点
2 years ago



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