why
01
なぜ, どうして
used for asking the purpose of or reason for something
例
Why are you late for school today?
なぜ今日学校に遅れたのですか？
02
なぜ
used to provide the reason for or the purpose of something
Why
01
理由, なぜ
the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores'
why
01
なぜ
used to introduce the reason for an action as the subject or object of the verb or preposition
例
Why he left is a mystery.
なぜ彼が去ったのかは謎です。
