be used to do sth 的同义句转换怎么转?

1.楼主指的是be used to do sth还是used to do sth啊?
2.be used to do sth = be used for doing sth 被用来做某事
3.但是楼主给的例句却是used to do sth.
二楼的答案也是正确的.
但是如果只有一空的话,则是：be used to do sth = would do sth
所以：I used to stay at England for holidays.
=I would stay at England for holidays.