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为什么要用to?It‘s cold in the room and I have to wear a thick jac

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为什么要用to?
It‘s cold in the room and I have to wear a thick jacket _to_keep myself warm.
It will take us about four hours _to_get _there by bus.
为什么不用ing
为什么要用to?It‘s cold in the room and I have to wear a thick jac
to 在这里是介词,表目的,意为“为了……”
再问: 为什么不用for
再答: 同样表目的的介词 for 和 to的主要区别: for后面跟名词或动名词,即“for something”或“for doing something” 例句: I'm learning English for my study. It's a machine for slicing bread. to后面跟动词,即“to do something”