be used to do 被用来做某事

be used to doing/sth 习惯做某事

used to do 过去常常做某事

be used to

(1) 被用做..be used to do

The quilt is used to keep warm.

(2)习惯..be/get used to doing

He has got used to new enviroments.

be used for +名词/动名词

The quilt is used for keeping warm.

used to do (did something very often in the past)

过去常做...

He used to go there. But now, he seldom go there.

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