—used to ask for information about someone or something
—used to describe a question
—used to ask someone to say something again because you have not clearly heard or understood it —often used to show surprise about the thing that someone has just said
2whatadjective
—used to ask someone to indicate the identity or nature of someone or something
—used to say that someone or something is remarkable for having good or bad qualities
—used to refer to an amount that someone has, uses, etc.