大学英语B级语法结构精讲——虚拟语气

发布于 2018-05-04 13:49  编辑:Ywen
0

2018年9月大学英语B考试马上开始,小编为各位参加大学英语B考试的考生整理了一些练习,各位考生赶紧练起来吧!


大学英语B级语法结构精讲——虚拟语气


语气是动词的一种形式,它表示说话人对某一行为或事情的看法和态度。虚拟语气表示动作或状态不是客观存在的事实,而是说话人的主观愿望、假设或推测等。


虚拟语气在条件从句中的用法

条件句有两类,一类是真实条件句;一类是非真实条件句,也就是虚拟条件句。

如果假设的情况是有可能发生的,就是真实条件句,谓语要用陈述语气。

如I fit doesn’t rain tomorrow, we will go to the park.

如果假设的情况是过去或现在都不存在的,或将来不大可能发生的,则是虚拟条件句。

如If he had seen you yesterday, he would have asked you about it.

在含有虚拟条件句的复合句中,它的基本特点是时态退后。


大学英语B级考试.png


列表如下:

(1)同现在事实相反的假设

句型:

条件从句

主句

一般过去时

should(  would) +动词原形

例:If they were here, they would help you.(要是他们在这儿,他们就能帮你了。)


(2)表示与过去事实相反的假设

句型:

条件从句

主句

过去完成时

should(would)  have+ 过去分词

例:The rice would not have been burnt if you had been more careful.


(3)表示对将来的假想

句型:

条件从句

主句

一般过去时

should(  would) +动词原形

were+  不定式

should+  动词原形


例:If you succeeded, everything would be all right.

If you should succeed, everything would be all right.

If you were to succeed, everything would be all right.

注意:虚拟条件句的从句部分如果含有were,should或had,可将if省略,再把were,should或had移到从句句首,实行倒装。例如:

Were they here now, they could help us.(要是他们在这儿,他们就能帮我们了。)=If they were here now, they could help us.

Had you come earlier, you would have met him.(你要是早点来,就可能碰见他了。)=If you had come earlier, you would have met him.

Should it rain, the crops would be saved.(要是下雨,庄稼或许能得救。)=If it should rain, the crops would be saved.


小编推荐:

更多大学英语B考试资讯>>>大学英语B考试

想要顺利通过大学英语B考试吗?考无忧网校助你顺利通关大学英语B考试>>>大学英语B考试题库

本文网址:http://www.k51.com.cn/info/ceb/1805/0438363.html
选择分享到: