第1个回答 2014-09-07
I used to be a teacher.这里的be是实意动词,意思是“成为”
used to 表示“过去惯常”,但“现在不做了”,指过去的习惯或状态,to 为不定式符号,后跟动词原形。有两点须注意:
①否定式。used to do sth.的否定式有两种形式:
used not (usedn’t)to do sth.
didn’t use to do sth.例如:
He didn’t use to (usedn’t to)like country music,but now
he is getting interested.
②疑问式。used to do sth.的疑问式也有两种形式。其简短回答中的to通常不予省略,但动词原形常被省略。
Did + sb.(主语)+ use to do sth.?
Used + sb.(主语)+ to do sth.?
Did he use to play basketball?
Used he to play basketball?
used to do 有两种否定形式
1.usedn't to do (used not to do)
2.didn't use to do
疑问也是两种
Used……?
Did……?
所以都可以,不过didn't use to 更加常见本回答被提问者采纳