宾语从句用虚拟语气的10种用法优秀8篇

编者按：虚拟语气(SubjunctiveMood)这一语法项目是各类英语考试中心测试的重点之一。下面是的小编为您带来的宾语从句用虚拟语气的10种用法优秀8篇，如果能帮助到您，小编的一切努力都是值得的。

虚拟语气的用法 篇1

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 alike, 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。If he had worked harder, he would have got through the exams.==>Had he worked harder, he would have got through the exams.If he were to leave today, he would get there by Friday.==>Were he to leave today, he would get there by Friday.If I were in your place, I wouldn’t do that.==>Were I in your place, I wouldn’t do that.

5、 有时虚拟条件句并没用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。如：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 （“要不是。”的意思）your help, I would not have succeeded.

II: 虚拟语气在从句中用should的情况:

1、 在表示建议，要求，命令，想法的动词后的从句里， 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、 在表示建议，要求，命令，想法的名词后的从句里， 用should + 动词原形， should可以省略。 如 advice, decision,agreement, command, 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 从句中动词的形式不变。

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（“如果。就好了”的意思） 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.

虚拟语气专项练习题解析 篇2

1、 If I ____ where he lived， I ____ a note to him.

A. knew， would

B. had known， would have sent

C. know， would send

D. knew， would have sent

2、 If they ____ earlier than expected， they ____ here now.

A. had started， would be

B. started， might be

C. had started， would have been

D. will start， might have been

3、 I didn't know his telephone number. ____ it， I ____ then.

A. Had I known， would ring him up

B. Should I know， would have rung him up

C. If I knew; would ring him up

D. Had I known; would have rung him up

4、 Mary is ill today. If she _____， she ____ absent from school.

A. were not ill， wouldn't be

B. had been ill， wouldn't have been

C. had been ill， should have been

D. hadn't been ill， could be

5、 Were I to do it， I ________ it some other way.

A. will do B. would do C. would have done D. were to do

6、 I ________ him the answer ________ possible， but I was so busy then.

A. could tell， if it had been

B. must have told， were it

C. should have told， had it been

D. should have told， should it be

7、 Without your help， we________ so much.

A. won't achieve B. didn't achieve C. don't achieve D. wouldn't have achieved

8、 You didn't take his advice. ________ his advice， you ________ such a mistake.

A. Had you taken， wouldn't have made

B. If you had taken， would make

C. Were you lo take， shouldn't have made

D. Have you taken， won't have made

9、 We wish we ____ what you did when we were at high school.

A. did B. could have done C. have done D. should do

10、 She wishes she ____ to the theatre last night.

A. went B. would go C. had gone D. were going

11、 Tom is very short now. His mother wishes that he ________ be tall when he grows up.

A. could B. should C. would D. were able to

12、 My sister advised me that I ________ accept the invitation.

A. could B. must C. should D. might

13、 He asks that he ________ an opportunity to explain why he's refused to go there.

A. is given B. must give C. should give D. be given

14、 Do you think of Wang Fang's suggestion that he ________ Mr. Li to the party?

A. will invite B. have invited C. is invited D. invite

15、 I insisted that he ________ at once.

A. be gone B. go C. would go D. might go

16、 Li Ming insisted that he ________ anything at all.

A. hadn't stolen B. shouldn't steal C. doesn't steal D. steal

17、 It is quite natural that my coming late again ________ them very angry.

A. had made B. would make C. makes D. make

18、 He acted as if he ________ everything in the world.

A. knew B. knows C. has known D. won't know

19、 Read it aloud so that I ________ you clearly.

A. may hear B. will hear C. hear D. have heard

20、 They got up early in order that they ________ they first train.

A. caught B. will catch C. might catch D. shall catch

21、 I am sorry that he ________ in such poor health.

A. are B. shall be C. were D. should be

22、 That is a good book. You ________ it yesterday.

A. could buy B. should buy C. should have bought D. bought

23、 It is high time we ________ home.

A. will go B. would go C. have gone D. went

24、 I'd rather that you ________ home.

A. went B. have gone C. will go D. had gone

25、 If only I _________ to the lecture!

A. listen B. will listen C. am listening D. had listened

26、 —— If he_____， he ______ that food.

---- Luckily he was sent to the hospital immediately.

A. was warned， would not take

B. had been warned， would not have taken

C. would be warned， had not taken

D. would have been warned， had not taken

27、 I didn't see your sister at the meeting. If she _________， she would have met my brother.

A. has come B. did come C. came D. had come

28、 Without electricity， human life ________ quite different today.

A. is B. will be C. would have been D. would be

29、 He ________ you more help， even though he was very busy.

A. might have given B. might give C. may have given D. may give

30、 If city noises _______ from increasing， people _______ shout to be heard even at the dinner table 20 years from now.

A. are not kept， will have to

B. are not kept， have to

C. do not keep， will have to

D. do not keep， have to

31、 Mike's father， as well as his mother， insisted that he ________ home.

A. stayed B. could stay C. has stayed D. stay

32、 Mr. Smith insisted that he ________ the work all.

A. had done B. have done C. did D. so

33、 Jane would never have gone to the party ________ that Mary would come to see her.

A. has she known B. had she known C. if she know D. if she has known

34、 If you had enough money， what ________?

A. will you buy

B. would you buy

C. would you have bought

D. will you have bought

35、 If you ________ that film late last night， you wouldn't be so sleepy.

A. didn't see B. haven't seen C. wouldn't have seen D. hadn't seen

36、 Our monitor requested that ________.

A. all the clastudied more carefully the problem

B. the problem was more carefully studied

C. with great care the problem could be studied

D. all the clastudy the problem more carefully

37、 —— Would you have called her up had it been possible?

Yes, but I ________ busy doing my homework.

A. was B. were C. had been D. would be

38、 His tired face suggested that he ________ really tired after the long walk.

A. had been B. was C. be D. should be

39、 It is important that we ________.

虚拟语气专项练习题解析 篇3

1.His doctor suggested that he ______ a short leave of absence.

A.will take　　 B.would take　　 C.take　　 D.took

2.The job would require that ______ at 7 o'clock every morning.

A.he will be at the factory　　 B.he be at the factory

C.he was at the factory　　 　　D.he has been at the factory

3.Your advice that she ______ till next week is reasonable.

A.will wait　　 B.is going to wait　　 C.waits　 D.wait

4.The housemaster was strict.He requested that we ______ television on week nights.

A.not watch　　　　　　　　　　　　　　 B.must not to watch

C.not be watching　　　　　　　　 　　　D.have not watched

5.It is necessary that a worker ______ his work on time.

A.accomplishes　　　　　　　　　　 B.can accomplish

C.accomplish　　　　　　　　　　　 D.has accomplished

6.It is important that he ______ his decision before Friday.

A.will make　　 B.makes　　 C.make　　 D.must make

7.You look so tired. It's time you ______ 。

A.go to sleep　　　　B.went to sleep

C.go to bed　　　　　D.went to bed

8.I'd rather you ______ anything about it for the time being.

A.do　　 B.didn't do　　 C.don't　　 D.didn't

9.But for water，it ______ impossible to live in the desert.

A.is　　 B.was　　 C.were　　 D.wouldn't be

10、 ______ it______ for your help，I couldn't have made any progress.

A.Had;not been　　　　　　　　　　 B.Should;not been

C.Did;not been　　　　　　　　　　 D.Not;be

11.Long ______ the Party!

A.lives　　 B.live 　　　C.will live　　 D.should live

12.Mary insisted that Tom ______ her the ring back.

A.gives　　 B.give　　 C.given　　 D.have given

13.My suggestion was that the meeting ______ off till next week.

A.to put　　　　　　　　　　　　　　　　 B.be put

C.should put　　　　　　　　　　　　　　 D.be putting

suggested that I ______ my homework first before watching TV.

A.did　　　　 B.do　　　 C.shall do　　D.have done

15.He insisted that nothing ______ till he arrived.

A.must be started 　　　　　　　　　　　　　　　　 B.ought to be started

C.could be started 　　　　　　　　　　　　　　　　D.should be started

suggests that Ann ______ the house.

A.can sell 　　B.sells 　　　C.sell 　　 D.sold

17.It's better that he ______ it from you.

A.'ll hear 　　 B.hears　　 C.should hear　　 D.heard

18.It was necessary that he ______ about what had happened.

A.be told 　　 B.was told　　 C.should tell 　　 D.tell

19.It's astonishing that she ______ sad at news that it has nothing to do with her.

A.felt　　 B.should feel 　　C.'ll feel 　　 D.would feel

20.It was strange that we ______ short of water in the country where it was always raining.

A.are 　　 B.be　　　 C.should be 　　 D.both B and C

21.It is strange that she ______ marry such an ugly man.

A.would　　 B.should 　　　C.shall　　 D.must

22.It's not right that the meeting ______ off till tomorrow.

A.must be put　　 B.must put　　 C.will be put　　 D.be put

23.It was impossible that he ______ the train, for he had started out very early.

A.could have missed 　　　　　　　　　　　　　B.must have missed

C.should have missed 　　　　　　　　　　　　 D.should miss

24.It's a pity that he ______ such a good chance.

A.should miss B.should have missed C.has missed D.all the above

25.He tried to find some excuse for the debt, but I insisted that he ______ it off at once.

A.must pay　　 B.ought to pay 　　C.paid　　 D.pay

Ford insisted that he ______ right, though the others didn't think so.

A.should do　　 B.should have done 　　C.had done　　 D.did

27.His pale face suggested that he ______ the sad news.

A.should be told 　　　　B.should have been told

C.was told 　　　　　　　 D.had been told

28.He suggested that we ______ here at once.

A.should leave　　 B.must leave　　　 C.left 　　 D.ought to leave

29.My order is that everyone ______ their own work in time.

A.must complete　　 B.completed　　　　 C.completes 　　 D.complete

30.We've made the decision that we ______ at the school gate at 7 tomorrow morning.

A.will gather 　　　　　　B.are about to gather

C.would gather 　　　　　D.should gather

31.----I'll be waiting for you at home.

---- ______ I were busy and couldn't come?

A.What if 　　 B.What when 　　C. How if 　　D.How when

32.After he was praised for what he had done, he said，“I ______ even better under harder conditions. ”

A.would do 　　B.would have done 　　C.did 　　D.had done

33.It has been raining for a day, but even though it ______ ， we ______ there by tomorrow.

A.hadn't rained, couldn't get 　　　　B.hadn't rained, can't get

C.didn't rain, couldn't get 　　　　　D.didn't rain, can't get

34.We could not have succeeded ______ your help.

A.but for 　　　　　　　　　　　　　　　　　　　　 B.without

C.if it had not been for 　　　　　　　　　　　　 D.all the above

35.I dare say he is not your true friend, because a true friend ______ differently when you were in trouble.

A.acted 　　　B.had acted C.would act 　　D.would have acted

参考答案：

1.C 　2.B 　3.D 　　4.A 　5.C

6.C 　7.D 　8.B 　　9.D 　10.A

11.B 12.B　 13.B 　14.B

15、 D insist作“要求别人做某事”解，其宾语从句用should型虚拟语气。

16、 C 这种should型虚拟语气，有时可将should省略，因此，C项的sell不能有人称变化。

17.C 本句话有“要求”的意思，故选C。

18、 A C、D为主动，在此不妥。

19、 B 选B表示了说话人带有一种十分惊讶的感情，选A项与she的人称不相一致，是错的。参见本章语法说明。

20、 D

21.B should带有感情色彩。

22.D 本句带有要求之意，故从句谓语用should型虚拟语气。D项中的should被省略。

23.C 本句带有惊讶之意，故从句须用should型虚拟语气。但由于是过去的事情所产生的惊讶，所以用should+不定式完成式。

24.D 如选A，这表达了说话人对将来的事所发出的感叹，选B则是对已经过去的事情的感叹。选C则是一个直陈语气，即说话人对此并不一定感到十分惋惜，而是对此事的陈述。

25.D insist在作“坚持要求别人做某事”时，需要用should型虚拟语气，should也可以省略。

26.C insist在作“坚持自己的观点、看法等”解时，不需要用虚拟语气，所以A、B两项用在此处不当。D项时态不准确，故也应排除。

27.D suggest作建议解时，后接了should型虚拟语气，但在本句中作“表明”解，这时不用虚拟语气，A、B两项都应排除，C项时态不当。

28.A 在本句中suggest作“建议”解，故选A。

29.D “建议”、“命令”、“要求”等动词的名词形式做主语时，其表语从句也须用should型虚拟语气，本句中的should被省略。

30.D “建议”、“命令”、“要求”等动词的名词形式做主语时，后接同位语从句时也须should型虚拟语气。

31.A What if…？常用于省略疑问句，既可以用于虚拟语气，也可用于直陈语气。本句不省略的形式为What would you do if。

32.B 本句的under引出一个非真实的条件，当然也可以是真实条件。根据上下文，应理解为与过去事实相反，故其谓语动词用would have done。

33.B even though=even if意为“即使”。它同if一样可以引出一个真实的让步从句，也可以引出一个非真实的让步从句。根据上文，even though是一个非真实的与过去事实相反的让步从句。而主句we can't get there却是一个真实的情况。

34.D

35.D 从全句的意思分析，a true friend-differently实际上是指一种假设，而when引导的从句又告诉我们，这是一个与过去事实相反的假设，故用would have acted。

虚拟语气专项练习题解析 篇4

1.I enjoyed the movie very much. I wish I _____ the book from which it was made.

A. have read　　　　　　　　 B. had read

C. should have read　　　　 D. are reading

2.You are late. If you _____ a few minutes earlier, you _____ him.

A. come; would meet　　　　　B. had come; would have met

C. come; will meet 　　　　　D. had come; would meet

3.The two students talked as if they _____ friends for years.

A. should be　　　　　 B. would be

C. have been　　　　　 D. had been

4.It is important that I _____ with Mr. Williams immediately.

A. speak　　　　　　　B. spoke

C. will speak　　　　 D. to speak

5.He looked as if he _____ ill for a long time.

A. was　　　　　 B. Were C. has been　　 D. had been

6.If the doctor had come earlier, the poor child would not _____.

A. have laid there for two hours 　　　　　　 B. have been lied there for two hours

C. have lied there for two hours　　　　　　　D. have lain there for two hours

7.I wish that I _____ with you last night.

A. went　　　　 　B. could go

C. have gone　　　D. could have gone

8.Let’s say you could go there again, how _____ feel?

A. will you　　　　　B. should you

C. would you　　　　 D. do you

9.I can’t stand him. He always talks as though he _____ everything.

A. knew 　　　　　　　　　　 B. knows

C. has known　　 　　　　　　D. had known

10._____ the fog, we should have reached our school.

A. Because of　 　B. In spite of

C. In case of　　 D. But for

11.If you had told me in advance, I _____ him at the airport.

A. would meet　　　　　　 B. would had met

C. would have met　　　　 D. would have meet

12.Mike can take his car apart and put it back together again. I certainly wish he_____ me how.

A. teaches 　　　　　　　　 B. will teach

C. has taught　　　　　　　 D. would teach

13.I would have told him the answer, had it been possible, but I _____ so busy then.

A. had been　　　　　　　B. were

C. was　　　　　　　　　 D. would be

14.He’s working hard for fear that he _____.

A. should fall behind　　　　B. fell behind

C. may fall behind　　　　　 D. would fallen behind

15.If it _____ another ten minutes, the game would have been called off.

A. had rained　　　　　B. would have rained

C. have seen　　　　　 D. rained

16.He suggested that they _____ use a trick instead of fighting.

A. should　　　　　　　 B. would

C. do　　　　　　　　　 D. had

17.My father did not go to New York; the doctor suggested that he _____ there.

A. not went　　　　　 B. won’t go

C. not go　　　　　　 D. not to go

18.I would have gone to the meeting if I _____ time.

A. had had　　　　　 B. have had

C. had　　　　　　　 D. would have had

19.Would you rather I _____ buying a new bike?

A. decided against　　　B. will decide against

C. have decided　　　　 D. shall decide against

20.You look so tired tonight. It is time you _____.

A. go to sleep　　　 　　　B. went to sleep

C. go to bed　　　　　　　 D. went to bed

21、—Why didn’t you buy a new car?

—I would have bought one if I _____ enough money.

A. had　　 　　　　 B. have had

C. would have　　　 D. had had

22.If she could sew, _____.

A. she make a dress 　　 　　　B. she would have made a shirt

C. she will make a shirt　　　 D. she would had made a coat

23._____ today, he would get there by Friday.

A. Would he leave　　　　 B. Was he leaving

C. Were he to leave　　　 D. If he leaves

24.His doctor suggested that he _____ a short trip abroad.

A. will take　　　　　B. would take

C. take　　　　　　　　D. took

25.The Bakers arrived last night. If they’d only let us know earlier,_____ at the station.

A. we’d meet them　　　　　　 B. we’ll meet them

C. we’d have met them　　　　 D. we’ve met them

26.If I _____ you, I _____ more attention to English idioms and phrases.

A. was; shall pay　　　　 　　　　B. am; will pay

C. would be; would pay　　　　　 D. were; would pay

27.We might have failed if you _____ us a helping hand.

A. have not given　　　　　B. would not give

C. had not given　　　　　 D. did not give

28.The law requires that everyone _____ his car checked at least once a year.

A. has　　 　　　　　　　　　 B. had

C. have　　　　　　　　　　　 D. will have

29.It is strange that he _____ so.

A. would say　　　　　 B. would speak

C. should say　　　　　D. will speak

30.Had I known her name, _____

A. or does she know mine?　　　　　　B. and where does she live?

C. she would be beautiful.　　　　　 D. I would have invited her to lunch.

31.He has just arrived, but he talks as if he _____ all about that.

A. know 　　　　　 B. knows

C. known　　　　　 D. knew

32.If I _____ the money, I would have bought a much bigger car.

A. possessed　　　　　　　　　 B. owned

C. had　　　　　　　　　　　　 D. had had

33.He was very busy yesterday; otherwise, he _____ to the meeting.

A. would come　　　　 　　　B. came

C. would have come　　　　　D. will come

34.The librarian insists that John _____ no more books from the library before he returns all the books he has borrowed.

A. will take　　　　　　　　　　 B. took

C. take　　　　　　　　　　　　　D. takes

35.I left very early last night, but I wish I _____ so early.

A. didn’t leave　　　　　　 B. hadn’t left

C. haven’t left　　　　　　 D. couldn’t leave

36.I do not have a job. I would find one but I _____ no time.

A. had　　 　　　　　　　　　　B. didn’t have

C. had had　　　　　　　　　　 D. have

37.I wish that you _____ such a bad headache because I’m sure that you would have enjoyed the concert.

A. hadn’t　　　　　 B. didn’t have had

C. hadn’t had　 　　D. hadn’t have

38.He insisted that we all _____ in his office at one o’clock.

A. be　　　　　　　　　 B. to be

C. would be　　　　　　 D. shall be

39.Helen couldn’t go to France after all. That’s too bad. I’m sure she would have enjoyed it if _____.

A. she’s gone　　　　　　　 B. she’ll go

C. she’d gone　　　　　　　 D. she’d go

答案：

1—5 BBDAD 　　　　　　6—10 DDCAD　　　　 　　　　 11—15 CDCAA　　　　　16—20 ACAAD

21—25 DBCCC 　　　　 26—30 DCCCD　　　　 　　　　 31—35 DDCCB 　　　　 36—39 DCAC

解析：

1.wish后面用虚拟语气，表示与过去事实相反用过去完成时。

2、条件句表示与过去事实相反，主句用过去将来完成时，从句用过去完成时。

3.as if后面如果表示真实情况就不用虚拟。

4.It is important that是主语从句的虚拟语气，从句用sb. should do的形式。

5.as if后面是真实情况，不虚拟。

6.lain是lie的过去分词，表示“躺”。

7.could have done表示“本来可以”。

8、与将来相反的虚拟语气，主句用过去将来时。

9.as if表示不可能发生的事情时用虚拟语气。

10.but for表示“要不是……的话”，通常与虚拟语气搭配使用。

11.in advance表示“事先”，表示与过去事实相反的虚拟语气。

12.wish的宾语从句表示发生在将来的愿望用过去将来时。

13.but的并列句表示真实情况，不用虚拟语气。

14.for fear that后面的状语从句用sb. should do的形式。

15、表示与过去事实相反，主句用过去将来完成时，从句用过去完成时。

16.suggest后面的宾语从句用sb. should do的形式。

17.suggest后面的从句用sb. should do的形式，should可以省略。

18、表示与过去事实相反，从句用过去完成时。

19.would rather的宾语从句用sb. did的形式。

20.It is time后面的定语从句用sb. did的形式。

21、第一个had是过去完成时，第二个had表示“有”。

22.would have done是过去将来完成时，表示与过去相反的虚拟语气。

23、这是虚拟语气的倒装形式，把if去掉，助动词提前。

24.suggest后面的从句用sb. should do的形式，should可以省略。

25、表示与过去事实相反，主句用过去将来完成时。

26、在虚拟语气中，不管什么人称，be动词都要用were的形式。

27、表示与过去事实相反，从句用过去完成时。

后面的从句用sb. should do的形式，should可以省略。

29.It is strange that是主语从句的虚拟语气，从句用sb. should do的形式。

30.had I known是与过去相反的虚拟语气的倒装形式。

31.as if表示不可能发生的事情时用虚拟语气。

32、第一个had是过去完成时，第二个had表示“有”。

经常可以搭配虚拟语气，表示与过去事实相反。

34、当insist表示“坚持认为”时不用虚拟形式。

35.wish后面用虚拟语气，表示与过去事实相反用过去完成时。

36.but的并列句表示真实情况，不用虚拟语气。

37.wish后面用虚拟语气，表示与过去事实相反用过去完成时。

38、当insist表示“坚持要求”时从句用虚拟形式。

39、表示与过去事实相反，从句用过去完成时。