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why (EN)
副詞、名詞、感動詞

副詞 “why”

why (more/most)
  1. なぜ
    Why did you decide to become a teacher?
  2. どうして(実際に答えを期待していない場合)
    Why don't you take a break?
  3. なんで(する必要がないことを示唆する質問に)
    Why worry about the rain when we can have fun indoors?
  4. 理由として
    He asked why she was crying.

名詞 “why”

単数形 why、複数形 whys または不可算
  1. 理由
    She always asked the whys behind her parents' rules, wanting to understand their reasoning.

感動詞 “why”

why
  1. 驚き、いらだち、または焦りを表す時代遅れの方法
    Why, I had no idea you were coming today!