どうして (doushite) is an interrogative adverb used to ask about the reason or cause for something. It means 'why,' 'how come,' or 'for what reason' in English. This word is essential for understanding motivations or explanations, such as 'Why did you do that?' (どうしてそうしたのですか?).
「どうして」は理由や原因を尋ねる疑問詞です。英語の「why」にあたり、「どうしてそうしたのですか?」のように、物事の理由を問う際に使われます。
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