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Must do A; have to A
12
       ので     しなくて  いけない  
Since my husband's pillow is really smelly, I have to wash it every day.
10
    やらなくちゃ いけない   
Why do I have to do that?
7
だけど          わなくちゃいけない  ・・・  
But I have an appointment with my client tomorrow.
18
あなた  もっと       なくてはいけない  
You must study grammar more.
7
あなた   すぐ そこ        いけない  
You need to go there immediately.
6
  こんなに        いけない   
Why do I have to wake up this early?

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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:
いかなくていけない (must go)

AVerb: ない form
-い
くちゃ
いけない
Basic Examples:
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
Where this grammar is found


User notes

Discussion about this grammar
Studying: JLPT 2
Level: 1, : 70
The kanji for せんたく are incorrect in the example sentence. It should be , not . (:
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2
14 years ago
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Site admin
Level: 168, : 8,111
Fixed, thanks.
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14 years ago
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Years Studied: 3
Studying: JLPT2
Level: 1, : 25
I have recently heard this with the more polite ikemasen instead of ikenai.
shinakutewa ikemasen - must do it
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1
13 years ago
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Site admin
Level: 168, : 8,111
Thanks - I went ahead and added that to the non-contracted form given above.
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13 years ago
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Years Studied: since 2000
Studying: のため、だから
Level: 1139, : 5,193
in the Baic Construction, what is the bit with the VE/10?
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12 years ago
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Site admin
Level: 168, : 8,111
What VE/10?? (fixed!)
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12 years ago
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Years Studied: 4
Studying: JLPT 5
Level: 1, : 51
Is
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12 years ago
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Site admin
Level: 168, : 8,111
??
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12 years ago
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Years Studied: 11 months
Studying: This site
Level: 1, : 374
Ive never really thought about it. is there a way to make this form in the past
such as "i had to go"
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11 years ago
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Years Studied: since 2000
Studying: のため、だから
Level: 1139, : 5,193
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 かなくてはいけなかった
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5
11 years ago
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Years Studied: 11 months
Studying: This site
Level: 1, : 374
thank you soo much.... sad to know ive been speaking this language forever and never...thought about this
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11 years ago
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Years Studied: 3
Studying: JLPT N3
Level: 1, : 287
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?
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11 years ago (Edited 11 years ago.)
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Years Studied: since 2000
Studying: のため、だから
Level: 1139, : 5,193
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.
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6
11 years ago
Level: 1, : 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?
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8 years ago
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Site admin
Level: 168, : 8,111
I don't think I've heard females using it more than males, but someone else might have a differing view.
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8 years ago
Years Studied: Since Nov 2018
Studying: JLPT N3
Level: 1, : 19

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

くてはならない ? any thoughts? 
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4 years ago
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Site admin
Level: 168, : 8,111
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.
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4 years ago
Years Studied: Since Nov 2018
Studying: JLPT N3
Level: 1, : 19
にとってなくてはならないである。
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.
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4 years ago
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Site admin
Level: 168, : 8,111
essential sounds good to me! It does *kind of fit* if you think of it this way:

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
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1
4 years ago
Years Studied: Since Nov 2018
Studying: JLPT N3
Level: 1, : 19
Thanks, that clarifies things up!
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4 years ago
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Level: 2, : 3

しなくてはいけない

Is ないといけない relevant or not?

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3 years ago
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Site admin
Level: 168, : 8,111

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..

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0
3 years ago



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