1、sth be used to do.某物被用来做某事，The mood is used to make desks.

　　2、sb be used to doing sth，某人 适应了/习惯了做某事,，并且be可以用become或者get替代。如：I am used to getting up early.

　　3、used to do,过去常常做某事，现在不再做了，如：She used to help me clean the room.她过去常常帮我扫地。

1、used to do 过去常常(表示现在不再) used to do过去常常，过去曾经;过去常常做某事He used to do his homework on Sunday, but now he often does homework on Saturday.他过去在星期天做家庭作业，但是现在他经常在星期六做作业。

2、eg: I used to swim in the lake near my village when I was young. be used to doing习惯于做某事 eg: My grandpa is used to going for a walk after dinner. be used to do 被用于。

3、 eg: Wood can be used to make paper"I used to do this rather regularly, particularly with shoplifters, " the judge said.“我以前经常这么判决，特别是对那些商店扒手，”法官说。

4、在选择题中看到be used to时，应当首先根据句子判断其所要的意思是什么，然后在决定选哪一个.

另外，当习惯做某事时，由于to是介词，所以要加动名词doing;而be used to do sth.是使用的被动语态，所以后面加动词原型.另外，如果强调渐渐适应，还可以用get used to doing sth.。