have had did do 的区别
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have had did do 的区别
各用在什么情况下
各用在什么情况下
have用在现在完成时中,强调对现在造成的影响.其后跟动词的过去分词.如:I have eaten three eggs,now I am not hungry.
had 1.如果做为‘有’的意思用在一般过去时态中.如,I had a book when I was four years old.
2.用在过去完成时中,had +动词的过去分词构成
did 用在一般过去时态中 do用于一般现在时中.如,I often do my homework at night.我经常在晚上做家庭作业.
I did my homework last night.我昨天晚上做了家庭作业.
had 1.如果做为‘有’的意思用在一般过去时态中.如,I had a book when I was four years old.
2.用在过去完成时中,had +动词的过去分词构成
did 用在一般过去时态中 do用于一般现在时中.如,I often do my homework at night.我经常在晚上做家庭作业.
I did my homework last night.我昨天晚上做了家庭作业.
have had did do 的区别
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