主要格式:yes,XXX did。或no,XXX didn't。did是do的过去式,done是过去分词,两者所用时态不同,在不同的语态中,表现也不同。另外,did还有表示强调意味的作用。例:Yes,they did。No,they didn't。
1.到底何时使用did?
did和其它助动词一样,本身无意义,自己不能独立作谓语,只能和其它主要动词一起构成谓语,用于构成一般过去时的否定句和疑问句,当然也常常用于代替上文中的行为动词的过去式。如:
I didn't go to school last Sunday. 上周日我没上学。
Did you buy a new pen yesterday? 昨天你买了枝新钢笔吗?
2.did身后的动词到底用什么形式?
有的小朋友总不注意did身后的动词用什么形式,在否定句和疑问句中,
did身后的动词必须用原形。 “他昨天没有在家吃午饭。”
[误] He didn't had lunch at home yesterday.
[正] He didn't have lunch at home yesterday.
3.我能用be动词代替吗?
不管怎么说,含有行为(实义)动词的一般过去时的肯定句变成否定句或疑问句时,不能用be动词,必须用到did!含be动词的句子构成否定句或疑问句都绝不会让did露面!
例句:They went to the park last week. (改为否定句)
[误] They weren't go to the park last week.
[正] They didn't go to the park last week.



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