1. used to do sth.；be used to doing sth.和be used to do sth.的区别
辨析：used to do sth.表示过去常常做某事.
e.g. I used to get up at six in the morning.
be used to doing.表示习惯做某事，to 后的动词用-ing形式
e.g. I'm used to getting up early.
be used to do sth. 指被用来做什么。
e.g. Pens are used to write.
