de nakereba

で　なければde nakereba

if not; (after na-adjectives and nouns)

From Lesson 380:The particle ば with nouns and な-adjectives·Japanese

Usages of de nakereba

彼かれ　が　学がく生せい　で　なければ、　入はいれません。kare ga gakusei de nakereba, hairemasen.

If he’s not a student, he can’t enter.

静しずか　で　なければ、　図と書しょ館かん　で　勉べん強きょうしません。sizuka de nakereba, tosyokan de benkyousimasen.

If it’s not quiet, I won’t study in the library.

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Nihon-shiki romanizationwatasi ha tyuugoku kara kimasita Hepburn romanizationwatashi wa chuugoku kara kimashita