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1、①used to do 过去常常（表示现在不再）eg: I used to swim in the lake near my village when I was young.②be used to do 被用于。

2、=④be used for sth./doing sth.eg: Wood can be used to make paper.③be used to doing习惯于做某事eg: My grandpa is used to going for a walk after dinner.。

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