You use why in questions when you ask about the reasons for something. Why hasn't he brought the bill? Why didn't he stop me? Why can't I remember the exact year we married?

Definition of why adverb in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

a. for what reason, purpose, or cause?: why are you here?. b. (used in indirect questions): tell me why you're here.

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When we ask for reasons in speaking, we can use the phrase why is that? In informal conversations we often say why’s that?: …

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