Loading
LingakuLingaku[sentence A]。なぜなら(ば)、[sentence B] + からだ／からです。 [sentence A]。なぜなら(ば)、[sentence B] + ためだ／ためです。 [sentence A]。なぜなら(ば)、[sentence B] + のだ／のです。
なぜなら stands at the beginning of the reason clause; the reason clause typically ends with からだ, ためだ, or のだ.
なぜなら is a conjunction meaning "because" or "the reason is." It is used to introduce an explanation or reason for a statement that has already been made in the preceding sentence. It's like saying "if you ask why…" – it retroactively provides justification.
The word itself is composed of なぜ (why) + なら (if), literally meaning "if (you ask) why." Because of this structure, なぜなら typically appears at the beginning of the explanatory sentence, and the reason clause usually ends with ～からだ / ～からです, ～ためだ, or ～のだ.
[Statement]. なぜなら、[Reason] からだ。
なぜなら is more formal and explanatory than simply using から or ので mid-sentence. It is common in written Japanese, essays, presentations, and logical arguments, though it also appears in spoken Japanese when someone wants to clearly state a reason.
なぜなら always refers back to a preceding statement. It cannot be used to introduce a reason before the main point – the conclusion or opinion must come first.
You may also encounter the fuller form なぜならば, which carries the same meaning but sounds even more formal or literary.