新概念英语第二册76-04

发布时间：2012-12-26 编辑：查字典英语网小编

the British : 英国人

虚拟语气(非真实条件句)

1、与现在事实相反

2、与过去事实相反

其从句的使用 :

1、与现在事实相反, 用一般过去时

2、与过去事实相反, 用过去完成时, 此时主句格式为would have done

would/could/should 都可以

must have done对过去的推测

can't have done对过去的推测

情态动词加have done 表示对过去的推测

wait for

wait for five minutes

I have waited five minutes. (for 可不要)

I have waited for you for five minutes.

I have waited five years for you.

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非谓语动词中的ing形式

1、表示其与主语是主动的关系

2、表示动作正在发生

非谓语动词中的ed形式表示其与主语是被动的关系

【Key structures】关键句型

1、虚拟语气与过去事实相反

特殊结构 : suggest/insist, 后接that从句(should+动词原形)

Exercise C Give the correct form of the verbs in parentheses: 用正确的动词填空 :

1 If you had told me about it earlier, I________(be able) to help you.

2 If you_______(can/come) with us, we would have been pleased.

3 You_________(not make) such a mistake if you had been more careful.

4 If father_______(be) alive, he would be horrified.

5 If it_______(be) fine tomorrow, we shall go for a swim.

1 would have been able

2 would have done 跟过去事实相反,从句会使用had done

could have done, 情态动词后面一旦加了have done 表示跟过去有关

3 would not have made

4 were : 虚拟语气与现在事实相反,从句使用一般过去时,与一般现在时相反的be 动词,用were代替

if I were you

5 is 真实条件句

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