TAKOBOTO

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The Japanese grammar content is from jgram.org licensed CC BY-SA 2.0.

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なければなりません
nakereba narimasen
JLPT N3
Edit  american57
Meaning
must ____; really should _____; it won't do if you don't ____.
You must use the large envelope.
Edit  american57
Formation
Phrases
やさいをたべなければなりません。
You must eat your vegetables.
Edit  #8651 Sakuratree
おみせでたまごをかわなければなりません。なければなりません。
I have to buy eggs at the store. なければなりません
Edit  #8652 Sakuratree
Discussion and comments
Use conditional negative verb "ba" form + "narimasen" (or "naranai" for informal/written). The Japanese is a double negative: "It will not do if you do not _____." Tends to be translated as "must _____" but is maybe not always that strong. A relative of "-te ha ikemasen."

手袋を持ってこなければならない。
Tebukuro wo motte konakereba naranai. You must bring gloves.
american57