なくてはいけない Meaning: must do; need to; gotta do.[A]
There are varieties for “must” sentences.
How to make |
Substitutable
combination |
Degree of politeness |
|
Take off い from Negative Short
form + e.x. Ru-verb
たべな U-verb
かかな Irregular
しな |
きゃ いと くちゃ くては ければ |
N/A だめ いけない ならない いけません なりません |
In casual speech In polite speech |
なくてもいいMeaning: don’t have to; it’s OK to not do.
How to make |
examples |
Translation |
In verbs in negative Short
form + replace the い with くてもいい(です) |
たべなくてもいい(です) |
You do not have to eat |
Exercise(なければ/なきゃいけません)
なくちゃいけません
Exercise(なくてもいい)
Genki 2
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