虚拟语气时be动词助动词提前表假设有哪几种？

虚拟语气有哪几种形式？~

虚拟语气

虚拟语气(Subjunctive Mood)这一语法项目是各类英语考试中心测试的重点之一。虚拟语气是一种特殊的动词形式，用来表示说话人所说的话并不是事实，而是一种假设、愿望、怀疑或推测。判断是真实条件句还是非真实条件句。只有在非真实条件句中才使用虚拟语气。通过句子意思，看假设的条件是否能够实现，能够实现是真实条件句，不能使用虚拟语气；假设的条件不能实现则是非真实条件句，要用虚拟语气.判断这个假设是与哪个事实相反。通常有三种情况：①与过去事实相反。②与现在事实相反。③与将来事实可能相反

I: 最基本的虚拟语气句型:
1. 虚拟现在时表示与现在事实相反的假设，其if 从句的谓语形式用动词的过
去式(be 一般用were)，主句用would/ should/ could/ might +动词原形。
　If places were a like, there would be little need for geographers.
如果各个地方都一样，就不需要地理学家了。

2. 虚拟过去时是表示与过去事实相反的假设，if 从句的谓语形式用过去完成时
即had＋过去分词，主句用would / should / could / might + have +过去分词。
　If he had known your address yesterday, he would have telephoned you.

3. 虚拟将来时是表示对将来实现的可能性很小的或不确定的假设。If从句的谓
语形式用一般过去式或用were to / should +动词原形，主句用would / should
/could/ might +动词原形。
　If he were to leave today, he would get there by Friday
4. 省略if 采用倒装语序的条件句。
　有时可以把含有助动词、情态动词、be或have的虚拟条件句中的连词if 省去，而将had , should, were 等 词
提到主语之前，即用倒装结构。
　 Had he worked harder, he would have got through the exams.
Were he to leave today, he would get there by Friday.
Were I in your place, I wouldn’t do that
5. 有时虚拟条件句并没来if 从句表示出来，而是用介词短语(otherwise, or, without, but for)、上下文或其它方 式来表示。
　We didn't know his telephone number; otherwise we would have telephoned him.
Without you help, I wouldn’t have achieved so much.
But for your help, I would not have succeeded.

II: 虚拟语气在从句中用should的情况:
1. 在建议,要求,命令,想法后的动词后的从句里, 用should + 动词原形, should 可以省略. 如 advise, agree, command, decide, demand, determine, grant, indicate, insist, order, prefer, propose, request, require, stipulate, suggest, urge, vote. 常考到的是: suggest, advise, demand, require, propose, insist, order, request.
His doctor suggested that he (should) take short leave of absence.
The author proposed that TV (should) be turned off at least one hour every day.

2. 在建议,要求,命令,想法后的名词后的从句里, 用should + 动词原形, should可以省略. 如 advice, agreement, command, decision, decree, demand, determination, indication, insistence, order, preference, proposal, request, requirement, stipulation etc.
It was Bill’s suggestion that everyone (should) have a map.
His suggestion was that everyone (should) have a map.
He gave us a suggestion that everyone (should) have a map.

3. 在It is/was +形容词后的that 从句中用should的结构, should 可以省略. 这类形容词常见的有: advisable, anxious, compulsory, crucial, desirable, eager, essential, fitting, imperative(绝对必要), impossible, improper, important, natural, necessary, obligatory, possible, preferable, probable, recommended, urgent, vital etc.
It‘s natural that she (should) do so.
It is essential that we (should) tell her the news.

4. 在 lest 和 for fear that( 以免) , in case (以防)从句中用should, should 可以省略.
She walked quietly lest she (should) wake up her roommates.
Have your gun ready in case we should need it.

III: wish 后的 that 从句中:
1. 表示现在或将来的愿望,从句中过去式.
I wish I knew his address.
I wish I were young.

2. 表示过去没有实现或不可能实现的愿望, 从句用过去完成式或would, could, might + have + 过去分词.
I wish you had written to him.
I wish I could have slept longer this morning, but I had to get up and come to class.

3. 如果将wish改成wished, 其后that 从句中的动词形式不变.
4. 如果that 从句中用would , 一般表示 对现状不满或希望未来有所改变 或请求
I wish he would answer my letter.
I wish prices would come down.
I wish you would help me.
I wish you would stop asking silly questions.

IV: 在 It’s about/ high/ first(second, third etc) time 后的that 从句中, 用过去式. 表示 “该是做什么的时候了”
It is about time you were in bed.
It is high time we left.
It is the first time I came here.

V: 在would rather, would sooner, would just as soon 后的that从句中, 用过去式或过去完成式, 表示”宁愿做什么”
I would rather he came tomorrow than today.
John would rather that she had not gone to the party yesterday evening.

VI: 在if only 感叹句中, 谓语动词与wish宾语从句的虚拟形式相同.
If only he didn’t drive so fast! (现在)
If only she had asked someone’s advice.(过去)
If only the rain would stop.(将来)

VII: 在as if / as though 从句中, 表示和现在事实相反或对现在情况有所怀疑, 用过去式; 表示过去想象中的动作或情况, 用过去完成式.
He speaks as if he were on the spot.
She spoke to me as if I were deaf.
This device operated as though it had been repaired.

注: 1. 在 as if / as though 句中, 如果有可能成为事实, 用陈述语气.
He looks as if he is going to be ill.
2. 在 insist 后的从句中, 如果是坚持自己, 用陈述语气, 坚持别人做什么事情, 用虚拟语气.
she insists that she is right.
she insisted that I should finish the work at once.

虚拟语气的用法及形式：
一、表示与现在事实相反的情况：
从句：If 主语+过去时(Be动词用were）
主句：主语+should/would/could/might+do
二、表示与过去事实相反的情况：
从句：If 主语+had+done
主句：主语+should/would/could/might+have done三、表示对将来情况的主观推测：　　
主句：主语+should+do　
从句：①if+主语+were to do
②if+主语+should/would/could/might+do
③if+主语+did（动词过去式）/were四、 有时，虚拟条件句中，结果主句和条件从句的谓语动作若不是同时发生时，虚拟语气的形式应作相应的调整。这种条件句叫错综条件句。①从句的动作与过去事实相反，而主句的动作与现在或现在正在发生的事实不符。②从句的动作与现在事实相反，而主句的动作与过去事实不符。五、 当虚拟条件句的谓语动词含有were,should,had时，if可以省略，这时条件从句要用倒装语序，即把were,should,had等词置于句首，这种多用于书面语。六、非真实条件句中的条件从句有时不表达出来，只暗含在副词、介词短语、上下文或其他方式表示出来，这种句子叫做含蓄条件句，在多数情况下，条件会暗含在短语中，如without…，but for…等。　　
七、 有时，虚拟条件句中，主、从句可以省略其中的一个，来表示说话人的一种强烈的感情。

扩展资料虚拟语气种类：

1、陈述语气：表示动作或状态是客观存在的、确定的或符合事实的，用于陈述句、疑问句和某些感叹句中。

2、祈使语：表示说话人对对方的请求、警告，建议或命令。

3、虚拟语气：虚拟语气表示说话人的主观愿望、猜疑、建议或与事实不符的假设等，而不表示客观存在的事实。虚拟语气是由句中的谓语动词的特殊形式表示出来的。　　
参考资料：百度百科-虚拟语气

1.在虚拟语气的从句谓语中出现 were, should, had 时，可以省略if,同时把这个词放到句首，形成倒装。
如： If I were you, I would not do that.= Were I you, ...
If he had known you earlier, things would have been better.= Had I known you...
If you should call on her tomorrow, she would be happy.= Should you call on her...
2. 还有一种由be引导的虚拟语气（相当于让步状语从句)，在倒装结构中有时会碰到，be动词提前放到从句句首，形成倒装结构。
如：
I'll come as promised, be it rainy or fine.
不论雨天晴天，我都将如约到来。

Everybody must obey the rule, be he a teacher or a student. 无论是老师还是学生，人人都必须遵守这个制度。

If it had not rained so hard yesterday we could have played tennis.→Had it not rained so hard yesterday, we could have played tennis. 另一种表达方式而已 口语中很少用到 （虚拟语气就是用来表示假设的）

三种：
if+主语+had_____had+主语
if+主语+were_____were +主语
if+主语+should___should +主语

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