connective N2 common politewritten
なぜかというと〜からだ — the reason being ... is because ~
なぜかというと〜からだ
Builds on なぜかというと
Meaning
- the reason is ... it's because ~ — the complete なぜかというと…からだ frame, opener plus closing からだ
Key sentence
急いでいる。なぜかというと、終電が近いからだ。
I'm in a hurry. The reason is that the last train is coming soon.
Easily confused with
Notes
- Not a separate pattern — it's なぜかというと paired with the からだ that normally closes it.
See なぜかというと〜からだ in real sentences
Jengo shows なぜかというと〜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 JengoSources Compiled with reference to A Dictionary of Advanced Japanese Grammar. Editorial confidence: medium.