N4 Lesson 8: 8/20
なければいけない なければいけない

なければいけない

must do
have to do

⚠ Verb[ない]+と+いけない/ならない is also used to express duty or necessity.

Structure Legend
Structure
CasualPolite
Verb[ない] + ければ + いけない
Verb[ない] + きゃ + いけない
[いけない often implies that an action must be taken in response to some circumstances, while ならない indicates that that action must be taken due to some rules, beliefs, etc.]
[いけない = neutral・ならない = formal/written]
なきゃ = short form of なければ

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仕事(しごと)行(い)かなければいけない。
Reload
Slow
Normal
I have to go to work.

Genki I 2nd Edition : Page 273
Tobira : Page 43
Tae Kim's Japanese Grammar Guide : Page 142