Meaning
A conversational way to say that something must be done.
Formation
- ない form + と + いけない — 行かないといけない
- Colloquial; speech often stops at 行かないと
When to use it
- Core use
- Have to do it, casual wording
Examples
20 sentences-
もう行かないといけない
I have to go now.
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明日までにこの本を返さないといけない
I have to return this book by tomorrow.
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朝は七時に起きないといけない
I have to get up at seven in the morning.
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今日は母の誕生日だからケーキを買わないといけない
It is my mother’s birthday today, so I have to buy a cake.
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会議の前に資料を印刷しないといけない
I have to print the materials before the meeting.
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風が強いからベランダの植木鉢を中に入れないといけない
The wind is strong, so I have to bring the flowerpots in from the balcony.
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今日中に料金を払わないといけません
I have to pay the fee today.
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金曜日までに申込書を出さないといけません
I have to submit the application form by Friday.
12 more examples
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試合の前にもっと練習しないといけません
I have to practice more before the match.
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人気の店なので予約しないといけません
It is a popular restaurant, so we have to make a reservation.
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小さな荷物を運ばないといけません
I need to carry the small luggage.
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青い封筒を選ばないといけません
I need to choose a blue envelope.
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古い雑誌を捨てないといけません
I need to throw away the old magazines.
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台所の窓を開けないといけません
I need to open the kitchen window.
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旅行の写真を見ないといけません
I need to look at the travel photos.
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短い手紙を書かないといけません
I need to write a short letter.
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友達の話を聞かないといけません
I need to listen to my friend's story.
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駅の名前を覚えないといけません
I need to memorize the station name.
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家の鍵を探さないといけません
I need to look for the house key.
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晩ご飯の準備をしないといけません
I need to prepare dinner.
Important notes
- ないといけない is a common conversational way to express obligation.
Common mistakes
- The negative ない belongs inside the condition; the whole expression still means must do.
Check yourself
Pick the translation of each sentence. The wrong options translate similar patterns, so watch the grammar rather than the words.
Similar grammar
Hear it in podcasts
The pattern appears in these episodes. They open in the app with the transcript and translation.
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