A casual, spoken contraction expressing obligation or necessity, equivalent to 'must' or 'have to'. It is a contracted form of 〜なくてはいけない or 〜なくてはならない.
Verb [なくちゃ-form]Primary
い-Adjective [stem] + くなくちゃ
な-Adjective + じゃなくちゃ
Noun + じゃなくちゃ
You use this when you must do something. It means "have to" or "must." It is a shorter, more casual way to say it.
あ、もうこんな時間！早く帰らなくちゃ。
Oh, look at the time! I have to go home soon.
昨日はレポートを完成させなくちゃだったので、寝不足なんだ。
I had to finish my report yesterday, so I'm sleep-deprived.
もっと野菜を食べなくちゃ、健康に悪いよ。
You have to eat more vegetables, or it'll be bad for your health.
今度の試験、絶対に合格しなくちゃ！
I absolutely must pass this next exam!
大事なプレゼンだから、スーツも新しくなくちゃだめかな。
Since it's an important presentation, I wonder if my suit has to be new...
Both '〜なくちゃ' and '〜なきゃ' mean 'must do'. They are very similar. You can use either one most of the time. Some people think '〜なくちゃ' sounds a little softer. They are much more casual than their longer forms.
Don't use this when you write formal letters. For example, don't use it for your boss. It sounds like a child speaking. Use longer forms like "〜なければなりません" instead.
Use this when you want to say "I must do X." It is like talking to yourself. You use it with close friends and family. It shows you realized something you need to do.
Often confused with(1)
Less formal alternatives(3)
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