used not do和didn't used to do有什么区别

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/10/04 16:52:25

used not do和didn't used to do有什么区别
前者是做情态动词吗?

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?

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