be used to后加什么词性?

问题描述:

be used to后加什么词性?

be used to do sth.(被动语态)被用来做sth.
be used to doing sth.习惯做sth.(有各种时态)这里的 to 是介词
used to do 过去常做sth.
eg:My father is used to getting up early.
Wood can be used to make paper.
I used to write letters to my friends.