why

なぜ,どうして,何のために

why の類語

what for, reason, wherefore, question mark, ground, problem, question, enigma, nut to crack, sixty-four dollar question, tough proposition, mystery, puzzle, sticker, puzzler, rationale, the why, proof, argument, chinese puzzle, excuse, crux, explanation, stumper, mind boggler, the idea, reason for, reason why, the big idea, poser, baffling problem, enigmatic question, jigsaw puzzle, crossword puzzle, perplexed question, brain twister, knot, stated cause, perplexity, for which, knotty point, underlying reason, for why, pretext, rational ground, how come, conundrum, mind-boggler, from what cause, on what account, vexed question, the wherefore, puzzlement, riddle, pretense, mystification, pourquoi, whyever

例文

• Why did you use up all the money?
  君はなぜお金を使い果たしたのか。
• Why is it that you are always late?
  君がいつも遅刻するのはどういう訳かね？
• Why do you want to buy this book?
  君はなぜこの本を買いたいのですか。

why の言い換えを探すには

why（なぜ）の類語・言い換え（パラフレーズ）を、日本語訳つきで関連度順に並べています。英作文の語彙を増やしたいとき、長文読解で本文と選択肢の言い換えを見抜きたいときに使えます。