connective N3 common politewritten

なぜなら(ば)〜からだ — the reason is, it's because ~

なぜなら(ば)〜からだ

Meaning

Key sentence

He didn't come. The reason is that something urgent came up.

Easily confused with

なぜなら Same construction. なぜなら(ば) opens the reason and 〜からだ closes it; the ば is an optional formal flourish. The full teaching layer lives at なぜなら.

See なぜなら(ば)〜からだ in real sentences

Jengo shows なぜなら(ば)〜からだ the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Study it in Jengo

Sources Compiled with reference to A Dictionary of Advanced Japanese Grammar.

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