1、肯定句:He used to go to work on foot.
否定句:He didn't use to go to work on foot.
一般疑问句:Did he use to go to work on foot?
肯定回答:Yes, he used to.
否定回答:No, he didn't use to.
2、肯定句:They used to live here.
否定句:They didn't use to live here.
一般疑问句:Did they use to live here?
肯定回答:Yes, they did.
否定回答:No, they didn't.
3、肯定句:I used to do exercise.
否定句:I didn't used to do exercise.
一般疑问句:Did you used to do exercise?
肯定回答:Yes, I do.
否定回答:No, I don't.
used to用法详解
1、其基本义为“过去常常”,注意以下用法:
(1)一般不能与表示次数(如twice,three times等)或一段时间(如three months,five years等)的词语连用,但可与always,often,sometimes,never等频度副词连用。
(2)构成否定式和疑问式时有两种形式:借助助动词did(较口语化)或直接将used用作助动词(较正式)。
2、used to与would的区别
(1)两者均可表示过去习惯性的动作,有时可互换。如:
When we were children we would go skating every winter. 我们小时候,每年冬天都去溜冰。
(2)当要表示过去持续的状态或表示过去与现在的对比(即“以前这样,但现在不这样了”)时,则要用used to。