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Must do A
These are shortened forms of ないといけない and なくてはならない.
好
5点
結 婚 す る なら 山 田 さ ん 、 禁 煙 しない と だ ね 。 
If you're going to get married, Mr. Yamada, you'll have to stop smoking.
好
5点
お 客 さ ん が 来 る 前 に 部屋 を 片 付 け な く ち ゃ 。 
I have to tidy up my room before the guests come over.
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5点
夏 は エアコン の 使 い 過 ぎ に 注 意 し な く ち ゃ ね 。 
I have to be careful so as to not overuse the AC during the summer.
好
4点
来 週 までに あの 人 に メール しない と ！ 
I have to email that person by next week!

Getting the sentences
Construction
(Elements in parentheses are optional.)
AVerb: ない form
と
Basic Examples:
急がないと (must hurry)

AVerb: ない form
-い
くちゃ\きゃ
Basic Examples:
来なきゃ (must come)

Where this grammar is found
Nihongo So-Matome N3 (日本語総まとめ）: 第1週　2日目
Nihongo So-Matome N4 (日本語総まとめ): 第２週　１日目
新完全マスター文法 N4: 第１部　１３課
JLPT N1 / Advanced: Jumble Question Pack ①


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Discussion about this grammar
avatar
mysticfive
Years Studied: since 2000
Studying: 自分のため、日本語教師だから
Level: 954, 好 : 5,016
~きゃ is used in the same way as ~くちゃ (行かなきゃ etc)
好
6点
11 years ago
avatar
マイコー
Site admin
 Level: 121, 好 : 6,891
Good point, forgot about my favorite form!
好
1点
11 years ago
avatar
narushisuto
Years Studied: 四年間ぐらい
Level: 1, 好 : 0
I'm not sure if I'm just stupid right now, but shouldn't it be 来なきゃ instead of くななきこ (at least that's what it says for me as an example)?
好
0点
9 years ago
avatar
マイコー
Site admin
 Level: 121, 好 : 6,891
Are you referring to the example that appears in the construction version? Is it shown in only hiragana (no kanji)?
好
0点
9 years ago
avatar
mysticfive
Years Studied: since 2000
Studying: 自分のため、日本語教師だから
Level: 954, 好 : 5,016
I'm seeing the example bit reading 来な無きゃ, actually - although it says 来なきゃ where I entered it in!
好
0点
9 years ago
avatar
マイコー
Site admin
 Level: 121, 好 : 6,891
mystic: do you have it forced to show all kanji in settings?
好
0点
9 years ago
avatar
マイコー
Site admin
 Level: 121, 好 : 6,891
I was able to reproduce the くなきゃ issue, and it should be resolved. Edit: sorry, only half fixed. Second Edit: should be fully fixed.
好
0点
9 years ago (Edited 9 years ago.)
avatar
mysticfive
Years Studied: since 2000
Studying: 自分のため、日本語教師だから
Level: 954, 好 : 5,016
マイコー I do have it set to force-show kanji; I was more worried about the extra な that snuck in there - seems to be gone though!
好
0点
9 years ago
avatar
マイコー
Site admin
 Level: 121, 好 : 6,891
Yea - when I first replied, I didn't even see the double な, just the く, which is why I replied the way I did. Anyways, should all be good, now!
好
0点
9 years ago
Erin88
Level: 43, 好 : 1

How would you use this in a past tense?

"Yesterday, I had to go to school."

好
0点
1 year ago
avatar
マイコー
Site admin
 Level: 121, 好 : 6,891

Well, this page is the contracted form of the ないといけない / なければならない, so using this in past tense would require the longer form:

昨日、学校に行かなければならなかった。

Hope this helps!

好
1点
1 year ago



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