题目内容：

used to do sth 过去常常做某事 be used to doing sth习惯于做某事之类的用法
used to do sth
be used to do sth
was used to do sth
be used to doing sth
be used for doing
之间的区分、用法、例句、加讲解详细,

优质解答

①【used to do sth.】：过去常常做某事（现在不做了） I used to go fishing everyday.
②【was used to do sth.是be used to do sth.的过去形式,用法一样】：某物被用来做某事 The pen is used to write letters.& The truck was used to transport goods.
③【be used for doing sth.】与上面的【be used to do sth.】都表示某物被用来做某事,只是介词不同 The pen is used for writing letters.
④【be used to doing sth.】表示习惯于做某事 I am used to getting up early in the morning.这个用法与【get used to (doing) sth.】的用法和意思一样,都表示习惯于做某事