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新目标英语八年级下册第九单元单元语法归纳

2011-02-10 00:00阅读：

http://blog.sina.cn/dpool/blog/u/1239914435

单元语法归纳

GRAMMAR

现在完成时(The Present Perfect Tense)
▲用法：表示过去发生或已完成的某一动作对现在造成的影响或结果或从过去开始一直延续到现在的动作或保存的状态。
▲构成：由“助动词have （has）＋过去分词”构成，其各种形式变化见下表。

肯定式
否定式
I／You have worked.
He／She／It has worked.
We／You／They have worked.
 I／You have not worked.
He／She／It has not worked.
We／You／They have not worked.
疑问式和简略答语
Have I／you worked?
Has he／she／it worked?
Have we／you／they worked?
 Yes，you／I have.
Yes，he／she／it has.
Yes，we／you／they have.
 No，you／I have not.
No，he／she／it hasn’t.
No，we／you／they haven’t.




【注】当表示从过去某一时刻延续到现在（包括“现在”在内）的一段时间的状语连用时，句中谓语动词应用延续性动词。如：
come go，leave，begin等动词，只表示瞬间发生的动作，如与一段时间连用，常用系动词加表语的结构代替。如：
He has been to China for three years.他到中国来已有3年了。
He has been away from the hospital for five hours.他离开医院已有5个小时了。


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