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突破 语法大冲关
UNIT 1 The mass media
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caught
was riding
have been
became
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played
had planned
had begun
had expected
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broke
was cleaning
had begun
were listening
became
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had gone
thought
will help
agreed
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had dug
fell
had been caught
turned
went
have destroyed
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谢谢观看 THANK YOU!
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过去完成时
一、过去完成时的构成
过去完成时由“had+过去分词”构成。
二、过去完成时的基本用法
1.表示在过去某一时间或某一动作之前完成的动作或存在的状态,即过去的过去。句中一般有明确的表示“过去的过去”的时间状语(从句)。
When walking down the street,I came across David,whom I hadn't seen for years.
沿街走路时,我偶然遇见了戴维,我已经有好几年没见他了。
2.表示从过去某一时间开始,一直延续到过去的另一时间的动作或状态,常用的时间状语:before,by then,by that time,by the end of,by the time+从句等。
It took me a long time before I was able to fully appreciate what they had done for me.
很久以后我才能够完全领会到他们为我做的一切。
3.表示“愿望、打算”的动词(如hope,want,expect,think,mean,suppose,plan,intend)用于过去完成时表示过去本打算实现而未实现的希望或计划。
I had intended to call on you yesterday,but I had an unexpected visitor.
昨天我本来打算去看你,但是来了一位不速之客。
4.常使用过去完成时的句型
(1)This/It/That was the first/...time+that sb.had done 这是某人第几次做某事
It was the third time that he had made the same mistake.
那是他第三次犯同样的错误了。
(2)It was/had been+一段时间+since sb.had done sth.自从……以来多久了
It was exactly five years since her father had died.
从她父亲去世到现在正好满五年。
(3)hardly(scarcely)...when.../no sooner...than...( 一……就……)主句用过去完成时,从句用一般过去时。
He had hardly got into the room when the telephone rang.
他刚一进房间电话铃就响了。
[名师点津] 若把句型中的hardly,scarcely,no sooner提前放在句首,主句用部分倒装,即将助动词had提前。
Hardly/No sooner had I got home when/than the rain poured down.
我刚到家,大雨就倾盆而下。
三、过去完成时、现在完成时和一般过去时的区别
1.过去完成时和现在完成时都表示一个完成的动作,强调的是某动作发生的结果,但它们参照的终止时间不同:过去完成时指到过去的某时间点为止已发生或完成的动作;现在完成时指到现在为止已发生或完成的动作。
He had learned advanced mathematics by himself before he went to university.
上大学之前他已经自学了高等数学。
He has already known the result,so you needn't tell him about it.
他已经知道结果了,所以你没必要跟他说了。
2.现在完成时和一般过去时都是发生于跟现在相对照而言的过去,但现在完成时强调的是已发生的动作对现在仍有影响;一般过去时仅强调在过去曾经发生过这个动作,不强