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LingakuLingaku[sentence A]。なぜなら + [sentence B (plain form)] + からだ / からです。
Note: なぜなら begins a new sentence explaining the reason for the preceding statement. The reason clause ends with からだ (plain) or からです (polite). から alone is also possible but less common in this pattern.
The structure なぜなら～から is used to provide a reason or explanation for a statement made in the preceding sentence. It translates to "the reason is because…" or "that is because…" in English. Unlike simply using から alone, this pattern places the conclusion or opinion first, then follows up with the reason introduced by なぜなら.
State your conclusion or opinion in the first sentence, then begin the next sentence with なぜなら and end the reason clause with から (or からだ / からです).
The reason clause before から is typically in plain form. The sentence often ends with からだ (plain) or からです (polite).
なぜなら～から has a somewhat formal and logical tone. It is common in written language, essays, speeches, and explanations. In casual conversation, speakers are more likely to simply use から or ので to give reasons within a single sentence. Using なぜなら in everyday chat can sound overly stiff or dramatic.
When using から alone, the reason typically comes before the conclusion:
With なぜなら～から, the order is reversed – conclusion first, reason second. This makes the reason feel more like an afterthought or deliberate justification.