used to 是英语中常见的英语短语。used to do sth.意思是“过去常常做某事,表示过去经常做或一直做而现在不做,它只用于过去时态。
(一)肯定句式:
主语+used to+动词原形……
例如:I used to go to the cinema,but I never have time now.我过去经常去看电影,但现在没有时间了。
He used to listen to pop music but now he likes rock music.他过去总听流行音乐,但现在喜欢摇滚了。
(二)否定句式:
A)主语+did not use to+动词原形……
B)主语+used not to+动词原形……
第一种否定句型,就是把used当做实义动词来看,所以变否定句要用助动词did;第二种否定句是把used当做情态动词,变否定句直接在used后面加not即可,used not可以缩写成usedn't或usen't。美式英语通常用A种形式,英式英语常用B种形式。例如:
You didn't use to drink.你过去不喝酒。
The shop usedn't to open on Sundays. 过去这家商店星期天不营业。
(三)一般疑问句式:
A)Did+主语+use to+动词原形……?
B)Used+主语+to+动词原形……?
美式英语通常用A种形式,英式英语用B种形式。例如:Did you use to go swimming in the river when you were young?你小时候经常在河里游泳吗?
Used he go to school by bike?他过去骑车上学吗?
(四)used to用于省略句时,肯定式保留to,否定式不保留to。例如:
――Used you play basketball?
――你过去常打篮球吗?
――Yes, I used to.(No,I usedn't.)
――是的,经常打。(不,不常打。)
I don't write to him now, but I used to.我现在不给他写信了,但过去经常写。
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