…ないと駄目だ
…-nai to dame da
In Japanese, "have to" is expressed through several forms, with the default form being …ないと駄目だ (…-nai to dame da). Wiktionary also lists …なきゃ (…nakya) and …なくちゃ (…nakucha).
Meaning: obligation (verb)
Ways to say it
| Japanese | Romanization (Wiktionary) | Note |
|---|---|---|
| …ないと駄目だ | …-nai to dame da | |
| …なきゃ | …nakya | informal |
| …なくちゃ | …nakucha | informal |
These expressions are used to convey obligation, necessity or a requirement to perform an action.
What does it mean word for word?
The phrase …ないと駄目だ literally translates to "if [one] does not [verb], it is no good".
Which one should you use?
The forms …なきゃ and …なくちゃ are both informal ways to express obligation. …なきゃ is a more casual, clipped version of the obligation, while …なくちゃ often carries a slightly more colloquial or "cute" nuance in spoken Japanese. In informal contexts, しないと is also used to imply necessity.
Is there a formal and an informal way to say it?
For formal situations, you can use しなければなりません or しなければいけません to express polite obligation or necessity. To convey a formal sense of necessity or a requirement, use 必要があります. In contrast, …なきゃ, …なくちゃ, しなきゃ and しないと are all informal or casual expressions.
How do you pronounce it?
…-nai to dame da
Did you know?
- Japanese obligation is fundamentally a conditional 'if' statement. To say 'I must go', a speaker literally says 'If I don't go, (something bad will happen)'.
- While …ないと駄目だ means 'have to', the word 駄目 (dame) can be shouted alone as a command meaning 'Stop!' or 'No!' in emergencies.
- The formal …なければなりません incorporates the verb なる (naru), which means 'to become', suggesting the obligation is a natural result of the situation.
Examples in context
- 彼は毎日のように会議に出席しなければなりません。He has to attend meetings almost every day.
- 私たちはプロジェクトの締切に間に合わせなければいけません。We have to meet the project deadline.
- 新しいシステムを導入する必要があります。It is necessary to introduce the new system.
- 明日までにレポートを書かなきゃ。I have to write the report by tomorrow.
- 宿題をやらなければならないから、遊べない。I can't play because I have to do my homework.
Sources
- Wiktionary, “have to” translations, CC BY-SA 4.0, dump of 2026-09-26.
