2008年5月10日第51期英语语法讲解，让你在不断积累中提高，能力提高就这么简单，每日一期，敬请关注
虚拟语气
2. 非真实条件句
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
练习：
1. There was a traffic jam; otherwise I ____ here on time.
A. would be B. had been
C. should be D. would have been
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2.Everything ______ if Albert hadn’t called the fire brigade.
A. will be destroyed C. will have been destroyed
B. would be destroyed D. would have been destroyed
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3. If he were not so lazy, I ____ (help)him. 如果他不是那么懒，我就帮助他。
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4. If she should leave today, she _____ (get) there on Monday.
如果她今天动身，她星期一就能到那儿了。
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