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used短语：

used to + 动原，“过去常常” He used to smoke.

be used to 译为“被用于…”，后接动原。 It is used to cut things. (主语是物)

be used to 译为“习惯于…”，后接动词ing或名词 / 代词. (主语常是人)

如：He’s used to working late. We are used to the country life. Are you used to it?

be used for “被用于…”，后接名词或动词ing (主语也是物) 如：

English is used for business. Knives are used for cutting things.

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