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.