used not do和didn't used to do有什么区别
前者是做情态动词吗?
人气:306 ℃ 时间:2020-05-17 05:38:20
解答
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....
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