虚拟语气：非真实条件句

文章作者 100test 发表时间 2008:03:15 10:07:09
来源 100Test.Com百考试题网

1）虚拟语气可以表示过去，现在和将来的情况，时态的基本特点是时态往后推移。

　　a. 与现在事实相反的假设

条件从句	主句
一般过去时（be用were）	should（would）等 动词原形

　　例如：If they were here， they would help you. 如果他们在这儿，会帮助你的。

　　含义：They are not here， they can‘t help you.

　　b. 与过去事实相反的假设

条件从句	主句
过去完成时	should（would）等 have 过去分词

　　例如：If he had come yesterday， I should / would have told him about it.如果他昨天来的话，我会把这件事告诉他的。

　　含义：He did not come yesterday， so I did not tell him about it.

　　c. 表示对将来不大可能发生的事情的假想

条件从句	主句
一般过去时	should/would等 动词原形
were 不定式
should 动词原形

　　例如：If you succeeded， everything would be all right. 如果你将来成功了，一切都会好的。

　　If you should succeed， everything would be all right.

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

　　含义：You are not likely to succeed， everything will be what it is now.