哪些英语单词后的从句用虚拟语气：（should ）be结构！要全的，越多越好！
1． 在宾语从句中，当主句谓语动词为command(命令)，order(命令)，suggest(建议)，
demand(要求)，require(要求)，insist(坚持)，desire(期望)，request(要求)，propose
(建议)，advise（建议）等时，从句谓语动词使用“should＋动词原形”结构，而且should可以省略
说明：suggest一词只有当译为“建议”时，后面的从句才能使用虚拟。译为“暗示、提出”
时，要按照宾语从句的规则。 insist译为“坚持要求，想要”时，后面的从句使用虚拟，否则按照宾语从句的规则。
2.
在主语从句中，尤其是把主语从句后置，形成It is… that …结构时，当It is之后
出现command，suggestion，demand，order，require， request等词的过去分词形
式；或者better，necessary，important等形容词时，that引导的主语从句中的谓语
动词使用“should＋动词原形”
3. 以lest、in case、 for fear that（译为：以防、以免、唯恐）等引导的从句用虚拟语
气，谓语动词使用should＋动词原形结构
1.动词suggest，order，demand，propose，request，command，insist等后的宾语从句中，用虚拟语气（即Should+动词原形或只用动词原形）来表示愿望、建议、命令、请求等。在动词wish /would rather后的宾语从句中，用过去式表示与现在事实不符，用过去完成式表示与过去事实不符。
e.g. I suggest that we（should）set off at once．
The doctor insisted that the patient (should)be X-rayed．
I wish I were as strong as you．
I would rather that you hadn't told him．
2. 在 suggestion， proposal，idea，plan，order，advice等名词后的表语从句、同位语从句中要用虚拟语气，即should+动词原形或只用动词原形。如：
Our suggestion is that you（ should）be the first to go．
My advice is that we（should）send for Doctor Li．
Do you know the order that you（should）keep watch？
3. 在It is necessary/important/strange/natural；It is requested/suggested/desired/proposed；it is a pity等结构后的主语从句中要用虚拟语气，即Should+动词原形或只用动词原形。如：
It is necessary that he（should）be sent there at once．
It is requested that Professor Li（should）give us a speech．
It is desired that we（should）get everything ready by tonight．
4. 在as if引导的状语从句中，用过去式表示与现在事实不符，用过去完成式表示与过去事实不符；They talked as if they had been friends for years．
5. 在so that，in order that引导的状语从句中，（根if状语从句中的主句形式相同）常用should/would/could/might+动词原形来表示虚拟语气。如：
She stayed at home for a few days so that she could take care of her mother．
He took a taxi to the station so that she should not miss the train.
6.在it is time后面的定语从句中常用过去式表示虚拟。
It’s time I was going.
It’s time somebody taught you to behave yourself.
7. 由wish引起的表示愿望的虚拟语气
A．用wish表示对现在的愿望时，它所引起的宾语从句中谓语动词形式为：过去式（be动词用were）。
B．用wish表示对将来的愿望时，它所引起的宾语从句中谓语动词形式为：would, could, might+ 动词原形。
C．wish用于对过去的事实表示一种不可能实现的愿望时，宾语从句中的谓语动词形式为：had+动词过去分词或could, would + have +动词过去分词。
I wish that he weren’t so lazy.
I wish I hadn't wasted so much time.
I wish she would change her mind.
8. had hoped/ planned/ thought/ wanted/ intended表示一种过去未实现的愿望或令人失望的事。
I had thought he had been dead for at least 20 years.
I had hoped that she would go to the U.S. and study there, but she said
she liked to stay in China.
9. would rather.( 与if 从句相同)
would (had) rather, would as soon, would sooner和would prefer所引起的从句中要求用过去式表示当时或将来的情况，用过去完成时表示过去的情况，表示希望或婉转的责备。例如：
I’d rather you posted the letter right away. 我倒希望你把这封信立刻寄出去。
I would prefer he didn’t stay there too long.我倒希望他不要在那儿可得太久。
I would just as soon you had returned the book yesterday.我真希望你昨天把这本书还了。
10. 虚拟语气在由某些连词,常见的这些连词和介词有：与if 从句相同
1) unless (除非)，provided(倘若)，supposing(假若)，providing(倘若) , on condition that(如果),由这些词、词组引出的从句，动词多用过去时。
除非你命令他做，要不他是不会做的。
He wouldn't do it unless you ordered him to.
假若你有机会出国，你会去哪儿呢？
Providing(if) you had the opportunity to go abroad, where would you go?
11. for fear that(以免, 唯恐)，in order that (以便)，whether(不管)，lest(以免)，in case (假使)，从句中加情态动词，有时should可省略。
他把它藏起来以免她看见。
He hid it lest she (should) see it.
我得准备点啤酒，说不定约翰会来。
I'll get some beer in case John should come.
他轻轻地进屋，以免吵醒他的同房。
He entered the room quietly in order that he should not wake his roommate．
12. if only, 与if 从句相同
如果表示对现在的愿望，句中的谓语动词常用过去式；
如果表示将来的愿望，句中的谓语动词常用would/could+动词原形；
如果表示对过去的愿望，句中的谓语动词常用had+过去分词。
if only I were you!
If only you had come yesterday!
If only Linda could go with us tomorrow!
If only I had said more about it!
还有最常见的就是if 条件句了，你应该挺清楚了吧。就不写了。
I suggested that the meeting (should) be put off.
The doctor ordered that she (should) stay in bed for a few days.
They demanded that the black people should be treated as well as white people.
注意:insist作"力言"、"强调"解时,宾语从句不用虚拟语气。只有当insist作"坚持(应该)"解时,宾语从句才用虚拟语气。例如:
Mike insisted that he had never stolen anything.
I insisted that you give me my money back.
二、虚拟语气用于表语从句、同位语从句做advice, idea, order, demand, plan, proposal, suggestion, request 等名词的表语从句和同位语从句,其谓语动词要用虚拟语气的结构"(should)+动词原形"。例如:
We all agreed to his suggestion that we (should)go to Beijing for sightseeing.
My idea is that he (should) do exercises first.
后接虚拟语气从句的动词
示例：
I recommended that the company invest in new property.
我建议公司在新的房地产上进行投资。
英语中有些动词后接宾语从句时，宾语从句中需用虚拟语气，以表示认为某事应该做。这类动词包括有：order, command, insist, demand, prefer, urge, require, request, ask, recommend, propose, suggest等。
We insist that the meeting be held as soon as possible.
我们坚持会议应尽快召开。
The committee recommended that the new regulations take effect next week.
委员会建议新的规章制度应在下星期生效。The editor prefers that footnotes be grouped at the end of the manuscript.
编辑提出脚注应集中放在正文之后。
The students requested that the teacher provide more information about the background of the reading materials.
学生要求老师多提供一些阅读材料的背景介绍。
在英国英语中，则更多使用should + 动词不定式的结构。
We insist that a meeting should be held as soon as possible.
我们坚持认为会议应尽快召开。
表示建议和命令意思的单词都用虚拟语气，如suggest . advise suppose recommend command . 除此之外，还有一些词组要是出现了也要考虑用虚拟语气，比如：as if , seem to ! 希望楼主能采纳
command request beg
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