used to后加do,表示过去常做某事而现在不再做了；
be/get used to后面加doing,表示习惯于某事或某物
We\'re used to the noise from the traffic now.
现在我们已经适应车辆往来的噪音了。
All I know is that she used to work in a bank.
我只知道她曾在银行工作过。
Things ain\'t what they used to be.
现在情况不比从前了。
You used to see a lot of her, didn\'t you?
你过去常见她吧？
