英语语法要点大全：虚拟语气
英语语法要点大全：虚拟语气
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1) 定义
虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，可能不是事实，或与事实相反。
2) 在条件句中的应用
条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设的或实质可能性不大的状况，故使用虚拟语气。
16.1 真实条件句
真实条件句用于陈述语气，假设的状况可能发生，其中 if 是假如的意思。
时态关系
句型： 条件从句 主句
通常目前时 shall/will + 动词原形
If he comes, he will bring his violin.
典型例题
The volleyball match will be put off if it ___.
A. will rain B. rains C. rained D. is rained
答案B。真实条件句主句为以后时，从句用通常目前时。
注意：
1) 在真实条件句中，主句不可以用be going to表示以后，该用shall, will.
If you leave now, you are never going to regret it.
If you leave now, you will never regret it.
2) 表示真理时，主句谓语动词便不需要shall +动词原形，而直接用通常目前时的动词形式。
16.2 非真实条件句
1)时态：可以表示过去，目前和以后的状况。它的基本特征是时态退后。
a. 同目前事实相反的假设。
句型 ： 条件从句 主句
通常过去时 should +动词原形
If they were here, they would help you.
b. 表示于过去事实相反的假设。
句型： 条件从句 主句
过去完成时 should have+ 过去分词
If she had worked harder, she would have succeeded.
The rice would not have been burnt if you had been more careful.
If my lawyer had been here last Saturday, he would have prevented me from going.
If he had come yesterday, I should / would have told him about it.
含义：He did not come yesterday, so I did not tell him about it.
If he had not been ill and missed many classes, he would have made greater progress.
含义： He was ill and missed many lessons, so he did not make greater progress.
c. 表示对以后的假想
句型： 条件从句 主句
通常过去时 should+ 动词原形
were+ 不定式 would + 动词原形
should+ 动词原形
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.
16.3 混合条件句
主句与从句的动作发生在不一样的时间，这个时候主，从句谓语动词的虚拟语气形式因时间不同而不同，这叫做混合条件句。
If you had asked him yesterday, you would know what to do now.
If it had rained last night , it would be very cold today .
16.4 虚拟条件句的倒装
虚拟条件句的从句部分假如含有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。
Were they here now, they could help us.
=If they were here now, they could help us.
Had you come earlier, you would have met him
=If you had come earlier, you would have met him.
Should it rain, the crops would be saved.
=Were it to rain, the crops would be saved.
注意：
在虚拟语气的从句中，动词be的过去时态一律用were，不需要was， 即在从句中be用were代替。
If I were you, I would go to look for him.
假如我是你，就会去找他。
If he were here, everything would be all right.
假如他在这儿，所有都会好的。
典型例题
_____ to do the work, I should do it some other day.
A. If were I B. I were C. Were I D. Was I
答案C. 在虚拟条件状语中假如有were, should, had这三个词，一般将if省略，主语提前, 变成 were, should, had +主语的形式。但应该注意，在虚拟条件状语从句中，省略连词的倒装形式的句首不可以用动词的缩略形式。如大家可说 Were I not to do., 而不可以说 Werent I to do.
16.5 特殊的虚拟语气词：should
1) It is demanded / necessary / a pity + that结构中的主语从句的谓语动词要用should 加动词原形， should 可省略。
句型：
suggested
It is important that+ do
a pity
suggested, ordered, proposed, required, demanded, requested, insisted; + do
important, necessary, natural, strange
a pity, a shame, no wonder
It is suggested that we hold a meeting next week.
It is necessary that he come to our meeting tomorrow.
2)在宾语从句中的应用
在表示命令、建议、需要等一类动词后面的从句中。
order, suggest, propose, require, demand, request, insist, command, insist + do
I suggest that we hold a meeting next week.
He insisted that he be sent there.
注意： 如suggest, insist不表示建议 或坚持要某人做某事时，即它们用于其本意暗示、表明、坚持觉得时，宾语从句用陈述语气。
The guard at gate insisted that everybody obey the rules.
判断改错:
You pale face suggests that you be ill.
Your pale face suggests that you are ill.
I insisted that you be wrong.
I insisted that you were wrong.
3)在表语从句，同位语从句中的应用
在suggestion, proposal, idea, plan, order, advice等名词后面的表语从句、同位语从句中要用虚拟语气，即+动词原形。
My idea is that we get more people to attend the conference.
I make a proposal that we hold a meeting next week.
16.6 wish的使用方法
1)用于wish后面的从句，表示与事实相反的状况，或表示以后不太可能达成的愿望。其宾语从句的动词形式为：
真实情况 wish后
从句动作先于主句动词动作 目前时 过去时
从句动作与主句动作同时发生 过去时 过去完成时
以后不大可能达成的愿望 以后时 would/could +
动词原形
I wish I were as tall as you. 我期望和你一样高。
He wished he hadnt said that. 他期望他没讲那样的话。
I wish it would rain tomorrow. 我期望明天下雨就好了。
2)Wish to do表达法。
Wish sb / sth to do
I wish to see the manager. = I want to see the manager.
I wish the manager to be informed at once.
16.7 比较if only与only if
only if表示只有;if only则表示假如就好了。If only也可用于陈述语气。
I wake up only if the alarm clock rings. 只有闹钟响了，我才会醒。
If only the alarm clock had rung. 当时闹钟响了，就好了。
If only he comes early. 但愿他早点回来。
16.8 It is time that
It is time that 后面的从句谓语动词要用过去式或用should加动词原形，但should不可省略。
It is time that the children went to bed.
It is high time that the children should go to bed.
16.9 need 不必做和本不该做
didnt need to do表示： 过去不必做某事, 事实上也没做。.
neednt have done表示： 过去不必做某事, 但事实上做了。
John went to the station with the car to meet Mary, so she didnt need to walk back home. 约翰开车去车站接玛丽，所以她不必步行回家了。
John went to the station with the car to meet Mary, so she neednt have walked back home. 约翰开车去车站接玛丽，所以她本不必步行回家了。
典型例题
There was plenty of time. She ___.
A. mustnt have hurried B. couldnt have hurried C. must not hurry D. neednt have hurried
答案D。neednt have done. 意为本不必，即已经做了某事，而时事实上非必要。
Mustnt have done 使用方法不正确，对过去发生的事情进行否定性判断应为couldnt have done, 不可能已经。 must not do 不能。
