N5 — outside your level filter

なくてはいけない

なくてはいけないnakute wa ikenaiN5neutral

savor + must do

ajiwawa nakute wa ikenai

must do; have to do

meaning: have to savor

Same meaning

もう遅おそいから寝ねなくちゃ。

mou osoi kara nenakucha.

It's late — I've gotta get to bed. casual

来週らいしゅうまでにビザを味あじわわなくてはいけない。

raishuu made ni biza o ajiwawa nakute wa ikenai.

I have to savor my visa by next week. neutral

Same meaning6

must do; have to — stating a plain obligation

もう遅おそいから寝ねなくちゃ。
mou osoi kara nenakucha.
It's late — I've gotta get to bed. casual
来週らいしゅうまでにビザを更新こうしんしなくてはいけない。
raishuu made ni biza o koushinshi nakute wa ikenai.
I have to renew my visa by next week. neutral
会員かいいんは年会費ねんかいひを納おさめなくてはなりません。
kaiin wa nenkaihi o osamenakute wa narimasen.
Members must pay the annual fee. formal

なくちゃnakuchacontraction
味あじわわなくちゃ
なくては shortens to なくちゃ in speech, and the ending usually drops — 早はやく寝ねなくちゃ。
なくちゃいけないnakuchaikenaicolloquial
味あじわわなくちゃいけない
The shortened front with the ending kept — the usual full spoken form.
なくてはならないnakutehanaranaiformal
味あじわわなくてはならない
Written necessity — rules, requirements, exam prose. Matches てはならない.