nakereba naranai なければならない

Predicative phrase (expressing obligation/necessity of the speaker) meaning: have to.

Nakereba may be replaced with nakutewa or the informal nakya.

1. After the stem of nai-form of verb
九時までに会社に行かなければなりません
Ku ji made ni kaisha ni ikanakereba narimasen.
I have to go to the company by nine o'clock.
もっと単語を覚えなければなりません
Motto tango o oboenakereba narimasen.
I have to learn more words.

2. After ku-form of adjective
アパートは駅にもっと近くなければならない
Apaato wa eki ni motto chikaku nakereba naranai.
The apartment house needs to be much closer to the station.

3. After (adjectival) noun + de
話は論理的なければならない
Hanashi wa ronriteki de nakereba naranai.
The speech needs to be logical.


-> See also: nakereba ikenai, nakutemo yoi, neba naranai

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