虚拟语气课堂使用（通用6篇）
在It is (high, about)time(that)…句型中，that引导的定语从句中的谓语常用一般过去时来构成虚拟语气。
例：It’s about time that we put an end to this controversy.
现在该是我们停止这场争论的时候了。
例：It is time we went to bed.
我们该去睡觉了。
二、虚拟语气用于if only 引导的从句中
在if only引导的从句中，谓语动词须采用虚拟语气，其用法与wish后宾语从句的用法基本相同，表示“但愿”，“要是…就好了”的意思。
例：If only I knew what you wanted.
要是我知道你需要什么就好了。
例：If only he had arrived in time,he would not have been punished.
他要是准时到达就好了。
经典练习：
1、It’s already six o’clock now. Don’t you think it’s about time____?
A)we are going home
B)we go home
C)we went home
D)we can go home
2、If only the committee____the regulations and put them into effect as soon as possible.
A)approve
B)will approve
C)can approve
D)would approve
3、It’s necessary____the dictionary immediately.
A)that he will return
B)that he returned
C)that he return
D)that he has to return
4、She must have had an accident, or he____then.
A)would have been here
B)had to be here
C)should be here
D)would be here
5、I apologize if I ____you, but I assure you it was unintentional.
A)offended
B)had offended
C)should have offended
D)might have offended
解析：
1、答案选C)。在it’s about time that…..句型中，定语从句的谓语动词应用过去时来表示虚拟语气。所以C项是正确的。
2、答案选D)。if only表示一种愿望，谓语用“would+动词原形”表示对将来事实的愿望，所以D是正确的。
3、答案选C)。在由it is necessary 等引导的主语从句要使用虚拟语气，虚拟语气的谓语动词用“should+动词原形”或动词原形。
4、答案选A)。由or引出的是与事实相反的假设条件，因此空缺处应填入表示虚拟语气的谓语动词。前一个分句中表示的是过去的时间，所以后一分句要用would have done的形式。所以A是正确的。
虚拟语气表示说话人的愿望、假设、猜测或建议，不是表示客观存在的事实，因此虚拟语气常用在含有非真实条件从句的主从复合句中。虚拟语气是通过句中谓语动词的特殊形式来表示的。所以掌握虚拟语气所使用的各种谓语动词的变化形式是学习虚拟语气的关键。
虚拟语气在条件句中的用法：
虚拟语气条件句是用谓语动词的特殊形式来表示与现在、过去事实相反的情况或对将来发生的情况表示猜测。虚拟语气条件句中所用的谓语动词的过去式、过去分词等只表示不同的虚拟情况，与陈述语气的过去时、过去完成时等不同。虚拟语气中，主句与从句中谓语动词的形式如下：
1. 表示与现在事实相反的情况
If I had more time, I would study Japanese.
如果我有更多的时间，我就学日语。(事实是：我现在没有更多的时间，因此我没有学日语。)
If she were not so busy, she would come here with me.
要是她不那么忙，她就和我一起来这里了。(事实是：她很忙，无法来这里。)
If you went to bed earlier, you would not be so sleepy in the morning.
如果你早点睡觉，早晨就不会这么困了。(事实是：你经常晚睡，所以早上很困。)
2. 表示与过去事实相反的情况
I would have bought that storybook if I had money with me yesterday.
如果昨天我身上有钱，我就买了那本故事书。(事实是：昨天我身上没有钱，所以就没买那本故事书。)
If you had worked hard, you wouldn’t have failed the exam.
如果你以前用功，你就不至于考试不及格了。(事实是：你之前没用功，所以考试失败了。)
He would have gone to bed if he had finished doing his homework in time.
假如他及时做完了作业，他早就上床睡觉了。(事实是：由于作业没及时完成，所以他没有去睡觉。)
3. 表示与将来事实相反的情况
If it rained tomorrow, our picnic would be put off.
如果明天下雨，我们的野餐就会推迟。(从句中谓语动词用过去式，表示说话人认为“下雨”的可能性不大)
注意事项：
当从句的谓语动词用过去式时，无论主语是什么人称，be动词的过去式一般用were。
主句谓语动词中的would可根据情况由should（用于第一人称），could或might替换。
课堂练习：
请用所给动词的正确形式填空。
1. If I come, I _____ (see) you.
2. If it is fine tomorrow, we _____ (go) for a walk.
3. If it rained, they _____ (stay) at home.
4. You will spoil it if you _____ (not be) careful.
5. We would be very much pleased if you _____ (come).
6. Will you help me if I _____ (need) you?
7. They will get wet if it _____ (rain).
8. What a pity!I haven’t got my car. If I had, I _____ (take) you to the airport.
9. We would answer if we _____ (can).
10. If you eat too much, you _____ (get) ill.
Key: 1. will see2. will go3. would stay4. are not5. came6. need
1.表示祝愿 a. Long live our country. b. May you succeed. c. May you be happy all your life.
2.表示命令 a. Everybody leave the room.
二.虚拟语气在非真实条件句中的用法: (使用虚拟语气的含条件句的复合句称为“真实条件句”)
1.表示与现在事实相反的情况时, if从句的谓语用动词的过去式 (be动词的过去式多用were, 而不用was), 主句的谓语用should / would / could / might +动词原形 (should多用于第一人称, would多用于二三人称, could / might可用于所有人称)
a. If I had more time, I should study computer better. b. If he were not so busy, she would attend the meeting this afternoon. c. If they didn’t take exercises every day, they wouldn’t be so healthy.
d. If you went to bed earlier, you would not be so sleepy in the morning. e. If she invited me, I should go to the party.
2.表示与过去事实相反的情况时, if从句的谓语用had done形式, 主句的谓语用should / would / could / might + have done的形式 a. If she had invited me yesterday, I should have gone to the party.
b. I would have checked my paper again if I had had more time at yesterday’s exam.
c. If you had taken the teacher’s advice, you would not have failed in the exam.
3.表示与将来事实相反的情况时, if从句的谓语形式是: ①.完全动词过去式 (be的过去式通常用were); ②.should +动词原形; ③.were to do. 其中②, ③种情况都含有“出乎意料之外”之意; 主句的谓语的形式是: should / would / could / might +动词原形 a. If she should invite me tomorrow, I should go to the party.
b. If it rained / should rain / were to rain tomorrow, our picnic would be put off.
c. If I saw him tomorrow, I would pass your note to him. d. I might come back if I were to miss the train.
三.虚拟语气在非真实条件句中用法的几个变体:
1.条件从句省略if: 在书面语中, 如果条件从句中的谓语中有were, had, should等词, 可将if省略, 而把were, had, should放在句首 a. Were I you (=If I were you ), I would get up early very early.
b. Had you arrived (=If you had arrived ) at the station ten minutes earlier yesterday, you could have caught the train.
2.省略条件从句或主句, 省略部分的含义仍有所体现. 省略主句时, 表示己不能实现的愿望
a. You could have done it yourself (if you had wanted to). b. I wouldn’t smoke (if I were you).
c. If my old friends were with me! (要是老朋友和我在一起该多好啊) d. If you could have seen the wonderful film!
3.主从句时间不一致时, 主从句谓语动词的形式取决于要表示的具体时间
a. You would speak English well if you had practised speaking it every day.
b. If she hadn’t trained so hard, she wouldn’t be able to run so fast.
4.假设的条件不以条件从句, 而以其他方式如介词短语、从句等表达出来, 这种句子称为含蓄条件句
a. What would you do with a million dollars? b. Without/But for music, the world would be a dull place.
c. We could have done better with more money. d. He would have given you more help, but he has been so busy.
e. He must have been very busy, or he could not have won the game.
f. I’m really very busy, otherwise, I would certainly take you to visit the zoo.
四.虚拟语气在as if / though从句中的用法:
1.表示与现在事实相反或对相在情况有所怀疑, as if / though从句谓语用过去式
a. He speaks English so well as if she had studied English in England. b. She looked as if she were ill.
2.表示与过去事实相反的情况, as if / though从句谓语用过去完成式
a. The machines operated as if it had been repaired.
**as if 从句也可表示真实情况，谓语动词用陈述语气 a. It looks as if it is going to rain.
五.虚拟语气在含even if / though从句的复合句中的用法:
在此类复合句中, 若表示与事实相反, 可用虚拟语气形式. 主从句的谓语动词形式与非真实条件句相同
a. Even if I were rich, I would work.
六.虚拟语气在主语从句中的用法:
如果表示说话人的看法, 想法或意见, 在句型 “It is / was + adj. + that从句”中, 主语从句中可用虚拟语气. 主语从句中谓语动词用should do表示现在或将来情况, 用should have done表示过去情况
a. It is necessary that you should clean the lab before you left. b. It is important that you should take the doctor’s advice.
c. It was very strange that he should have left without say goodbye.
七.虚拟语气在宾语从句中的用法:
1.在wish的宾语从句中, 通常表示不可能实现或没有实现的愿望, 常用虚拟语气
①.wish的宾语从句用过去式, 表示现在或将来没有实现或不可能实现的愿望
a. I wish I knew the result of the match now. b. I wish it were spring here all the year round.
c. I wish I could help you. d. I wish I were young.
②.wish的宾语从句用过去完成式, 表示过去没有实现或不可能实现的愿望
a. We wish we had got the film tickets last night. b. I wish you I had met him yesterday.
③.wish的宾语从句若用would, 则一般表示请求, 对现状不满或希望未来有所改变
a. I wish the prices would come down. b. I wish you would help me.
c. I wish he would be more careful. d. We wish you would spend the holiday with us.
2.在动词suggest (建议), advise (建议), propose, demand (要求), require (要求), order (命令), insist (坚持)后的宾语从句中, 谓语动词常用“( should )+动词原形”的虚拟语气形式
a. I suggested that we should go there at once. b. I demand that he should answer me at once.
c. The doctor insisted that the patient should stay in bed for two weeks. d. The officer ordered that the soldiers should stop playing.
与名词suggestion建议 / advice 建议 / demand要求 / request要求 / order命令有关的从句(包括同位语从句、表语从句、主语从句等)中的谓语也用 “( should ) +动词原形”
a. The black people made a strong demand that the government ( should ) take steps to change the unfair situation.
b. Their demand is that the government should take steps to change the unfair situation.
c. I was Bill’s suggestion that everybody should have a map. d. His suggestion was that everybody should have a map.
e. What do you think of their proposal that we should all speak English at the meeting?
f. It is requested that she should sing a song at the birthday party.
**注意，含上述动词的简单句不用虚拟语气
a. The officer ordered his men to start before daybreak. b. The salesman suggested us /our trying another shop.
**注意，suggest解释“表明、暗示”、insist解释“坚持说、硬要说”，则不用虚拟。
a. The man’s expression suggested that he was very sad. ` b. Tony suggested that he had not broken the vase.
八.虚拟语气用在句型: It is (high) time that…(该做某事了)中: that从句中的谓语动词用过去式
a. It is time we got up.
九.虚拟语气用在if only引导的感叹句中: 表示“但愿…”, “要是…就好了”, 其中谓语形式与wish的宾语从句相同
a. If only he didn’t drive so fast! ( =I wish he didn’t drive so fast.)
b. If only he had taken the doctor’s advice. ( =I wish he had taken the doctor’s advice.)
c. If only the rain would stop! ( =I wish the rain would stop.)
十.虚拟语气用在would rather / prefer后的that从句中: 表示现在或将来情况谓语动词用过去时形式, 表示过去情况动词用过去完成时形式
a. I would rather he came next Saturday. b. I would prefer you had seen the film yesterday.
A. would be B. would have been C. were D. may be
2. ________more careful, his ship would not have sunk.
A. If the captain were B. Had the captain been
C. Should the captain be D. If the captain would have been
3. If he _________ me tomorrow, I would let him know.
A. should call B. should not have been able
C. were not able D. are not able
4. If you asked your father, you ______________ permission.
A. may get B. might get C. should have called D. maybe get
5. _____________today, he would get there by Friday.
A. Would he leave B. Was he leaving
C. Were he to leave D. If he leaves
6. ______I you, I would go with him to the party.
A. Was B. Had been C. Will be D. Were
7.The millions of calculations involved, had they been done by hand, __________all practical value by the time they were finished.
A. could lose B. would have lost
C. might lose D. ought to have lost
8. Had Paul received six more votes in the last election, he ____________our chairman now.
A. must have been B. would have been C. were D. would be
9. If you ________________Jerry Brown until recently, you’d think the photograph on the right was strange.
A. shouldn’t contact B. didn’t contact
C. weren’t to contact D. hadn’t contacted
10. ____________he English examination I would have gone to the concert last Sunday
A. In spite of B. But for C. Because of D. As for
11. Look at the terrible situation I am in! If only I _____________your advice
A. follow B. would follow C. had followed D. have followed
12. Had Paul received six more votes in the last election, he ____________our chairman now.
A. must have been B. would have been
C. were D. hadn’t contacted
13. If the horse won today, it _____________ thirty races in five years.
A. would have won B. won C. must have won D. did have won
14. There is a real possibility that these animals could be frightened, _______a sudden loud noise.
A. being there B. should there be
C. there was D. there having been
17. I would have gone to visit him in the hospital, had it been at all possible, but I ______ fully occupied the whole of last week.
A. were B. had been C. have been D. was
18. I apologize if I __________ you, but I assure you it was unintentional(无意的)l.
A. offend B. had offended
C. should have offended D. might have offended
19. If you hadn’t taken such a long time to get dressed, we’d______________ there by now.
A. be B. circles C. is circling D. be circling
20. The sun rises in the east and sets in the west, so it seems as if the sun ________round the earth.
A. were circling B. circles C. is circling D. be circling
21. I wish that I _______________ with you last night.
A. went B. have gone C. could go D. could have gone
22. I wish I ___________ with her.
A. would be B. am C. was D. were
23. I wish that I_____________ the concert last night.
A. could B. have attended C. could have attended D. attended
24. The picture exhibition bored me to death. I wish I_______________ to it.
A. had not gone B. have not gone
C. did not go D. can not have gone
25. “I wish you___________ me to put these things away,” he said.
A. will help B. help C. are helping D. would help
26. If the Watergate Incident_____________ Nixon would not have resigned from the presidency.
A. did not occur B. had not occurred C. was not occurring D. be circling
27. I hadn’t expected ________James to apologize but I had hoped .
A. him calling me B. that he would call me
C. him to call me D. that he call me
28.George would certainly have attended the meeting, ____________________ .
A. if he didn’t get a flat tire B. if the flat tire hadn’t happened
C. had he not had a flat tire D. had the tire not flattened itself
29. The teacher suggested that her students _____________ experiences with ESP.
A. write a composition on their B. to write composition about the
C. wrote some compositions of his or her D. had written any compositions for his
30. He speaks Chinese as fluently as if he ______________a Chinese.
A. were B. had been C. is D. has been
31. As usual, he put on a show as though his trip____ a great success.
A. had been B. has been C. were D. was
32. Looking round the town, he felt as though he ______________ away for ages.
A. has been B. was C. is D. had been
33. John is so strongly built that he looks as if he ______as elephant.
A. lifts B. is lifting C. lifted D. could lift
34. He described the town as if he_____________ it himself.
A. had seen B. has seen C. saw D. sees
35. At that thought he shook himself, as though he _____________from an evil dream.
A. woke B. wakes C. would wake D. had woke
36. Most insurance agents would rather you ___________ anything about collecting claims until they investigate the situation.
A. do B. don’t C. didn’t D. didn’t do
37. Although most adopted persons want the right to know who ______________their natural parents are, some who have found them wish that they the experience of meeting.
A. hadn’t B. didn’t have had C. hadn’t had D. hadn’t have
38. It is important that the TOEFL office ________ your registration.
A. will confirm B. confirm C. confirms D. must confirm
39.Without electronic computers, much of today’s ___________advanced technology .
A. will not have been achieved B. have not been achieved
C. would not have been achieved D. had not been achieved
40. He speaks Chinese as fluently as if he ____________a Chinese.
A. were B. had been C. is D. has been 41. It is time that the government ______________measures to protect the rare birds and animals.
A. takes B. took C. has taken D. taking
42. Some people are too particular about school records, insisting that every applicant ___all diplomas from elementary school to university.
A. has B. will have C. should have D. must have
43. He was very busy yesterday, otherwise he _____ to the meeting.
A. would come B. came C. would have come D. had come
44. I must say he reads very well, and I shouldn’t be surprised if he___________ acting for a living one day.
A. had taken up B. takes up C. have taken up D. would have taken up
45. If I had seen the movie, I ______________ you all about it now.
A. would tell B. will tell C. have told D. would have told
46. I hadn’t expected ______Henry to apologize but I had hoped .
A. him to call me up B. him calling me up
C. that he would call me up D. that he will call me
47. I had hoped that John ____________a year in Africa, but he stayed there only for three months.
A. spends B. spent C. would spend D. will spend
48. I had hoped that Jennifer___________ a doctor, but she wasn’t good enough at science.
A. will become B. became C. would become D. becomes
49. I’d rather you ___________ anything about it for the time being.
A. do B. didn’t do C. don’t D. didn’t
50. I’d just as soon_______ rudely to her.
A. that you won’t speak B. you not speaking
C. you not speak D. you didn’t speak
51. It’s high time they____________ this road.
A. mend B. mended C. must have mended D. will mend
52. It’s about time people______ notice of what women did during the war.
A. take B. took C. have taken D. will take
53. Everybody has arrived. It’s time we___________ the class.
A. shall start B. would start C. had started D. start
54. ___________ the English examination I would have gone to the concert last Sunday.
A. In spite of B. But for C. Because of D. As for
55. Mary ___my letter; otherwise she would have replied before now.
A. has received B. ought to have received
C. couldn’t have received D. shouldn’t have received
56. John did not feel well yesterday; otherwise he _______to see his classmates off.
A. came B. would come C. would have come D. should be coming
57. He’s working hard for fear that he_____________ .
A. should fall behind B. fell behind
C. may fall behind D. would fall behind
58. Without the dreams of the youth, this invention might____________ for a century.
A. have been postponed B. has been postponed
C. postpone D. be postponed
59. In the past men generally preferred that their wives_______________ in the home.
A. worked B. would work C. work D. were working
60. For a child to give up his less mature idea for a more mature one, it requires that the child _____psychologically ready for the new idea.
A. is B. were C. be D. would be
61. Tom’s father, as well as his mother,_______________ in New York for a few days more.
A. ask him to stay B. ask he to stay
C. asks he stays D. asks he stay
62. Your advice that_____________ till next week is reasonable.
A. she waits B. she wait C. wait she D. she waited
64. It was essential that we lease before the end of the month.
A. sing B. singed C. had signed D. were signing
65. It is appropriate that some time ______thorough study of the results of the Apollo mission.
A. devotes to B. devoted to C. is devoted to D. be devoted to
答案与详解
1.A.条件句表示与现在事实相反的虚拟。
2.B.条件句表示与过去事实的虚拟。
3.A.条件句表示与未来事实的虚拟。
4.B.条件句表示与未来事实的相反。
5.C.条件句表示与现在事实的虚拟。
6.D.条件句表示与现在事实的虚拟。
7.B.这个句子中含有一个省略if，把助动词提前到主语they之前的虚拟条件句，该条件句表示对过去情况的假设，而主句中by the time they were finished 表明主句也应该是对过去发生的情况的假设，因而应该选(B)would have lost为正确答案。
8.(D)这道题目是一个混合虚拟语气的句子。条件句省略了if，把助词had提前到主语前面，表示对过去情况的假设，而主句中now表明了对现在情况的假设，所以应选would(should, could, might)+动词原形这种表达形式。四个选项中只有(D)是正确表达形式，故为正确答案。
9.(D)until recently，因此(D)是正确答案，而主句是隐含的对现在情况的假设，该句是一个混合虚拟条件句。
10.(B)假设的情况有时不是用一个条件句表示，而是隐含在一个由介词如but for、but that、without, 由连词but、副词otherwise 、比较级、形容词、独立主格等表示的上下文中。本句主句表示对过去情况的假设，但事实上由于英语考试而没有去成，即若不是因为英语考试，我本可以去听音乐会，所以应选But for为正确答案。
11.(C)题目中的第一句话表示的是现在真实的情况，而第二句话中所要表达的是应该做但事实上没有做的事，这种情况导致第一句话中真实情况的发生，故If only条件句假设的是过去一种情况，因此应该用had +过去分词，所以正确答案是(C)。
12.D.注意主句now表示现在的时间状语，所以主句是对现在虚拟，从句是对过去虚拟。
13.A.从句对过去的虚拟。
14.B.从句表示虚拟，而主句是事实。
17.(D)本道题目的前半句话是对过去情况的一种假设，但事实上并没有发生，而事实上没有发生的真实原因是句子的后半部分由but引导的转折句所表述的真实。因而but所引导的句子中应该用表示志过去事实相符合的表陈述的时态，即一般过去时。
18.(B)此题要求在if从句中选择适当的动词形式，以主句中的动词apologize(抱歉)来看，if从句中表达的内容应该是过去做的事，因此可以排除(A)，因为(A)是现在时。(C)中should+have+过去分词结构表示本来应该做却没有做的事，在此不合题意。(D)选项中的might+have+过去分词表示对过去发生的事情很不肯定的猜测，它表达的内容还不能成为事实，所以藉此道歉真是不知从何说起，因此此处也不合题意。(B)had offended表示当时已经发生了的动作。这是复杂条件句：apologize 是现在，而条件句是表示对过去假设的条件句。
19.(A)该句也是一个复杂条件句(或称作混合虚拟条件句)。条件句表示对过去情况的假设，而主句表示对现在情况的假设，但事实上却与此相反，所以正确答案应该是(A)。
20.(A)as if引导的从句要求用虚拟语气，表示同时或将来的情况，动词要用过去式(be动词用were)或would(could等)+动词原形，本句话中指的是当时的情况，所以要用过去式，故(A)是正确答案。
21.D. 22.D. 23.C. 24.A. 25.D.
26.(B)had not occurred表示对过去的虚拟，条件句中要用过去完成式，主句中要用should(would, could, might)+动词原形的过去分词。
27.(B)had hoped是常见的要求其后的宾语从句用虚拟语气的句型,虚拟语气would+动词原形。
28.(C)表示对过去情况的假设，主句动词形式为would(should, could, might)+have+过去分词，条件句为过去完成式，if可以省略，但要把had提前主语前面。(B)，(D)的表达不符合英语表达习惯，所以(C)是正确答案。
29.(A)suggest后面的从句要用虚拟语气形式，其形式为should(可以省略)+动词原形。
30.A.表示与现在相反的虚拟。
31.A.as though引导的与过去相反的虚拟。
32.D.felt是过去式，所以该句是由as though引导的与过去相反的虚拟。
33.D.as if引导的与现在事实相反的虚拟。
34.A.as if引导的与过去相反的虚拟。
35.C.
36.(D)would rather后接从句要求用虚拟语气，形式为过去式，表示对现在或将来的假设，或为过去完成式表示对过去的情况的假设。
37.(C)who引导的定语从句中的现在完成时表示动作业已发生，所以主句中表示的虚拟是针对已经发生了的行为，所以应该用过去完成式表示对过去的虚拟。
38.(B)
39.(C)这是一人含蓄虚拟条件句，通过介词短语without,表示潜在的一种假设，而主句中的情况也早已经发生，所以是对过去情况的一种假设，因此用would not have been achieved这一形式。
40.(D)连so that引导的从句中要求用虚拟语气，表示一种假设，形式为might+动词原形。
41.(B)It is time that是一种要求从句用虚拟语气的常见句型。虚拟语气形式为动词的过去式。
42.(C)
43.(C)otherwise用来表示一种含蓄的虚拟假设，因为是对过去(yesterday)的情况的假设，所以应该用would have come形式。
44.(B)所给的四个选项中没有一个表示对未来的情况的虚拟的形式should+动词原形，或是were to do，因此可以断定if引导的条件句在这里最真实的条件句，用一般现在时表示一般将来时，故(B)是正确答案。
45.(A)这是一个混合虚拟语气的句子，if条件句表示的是对过去情况的假设，而主句是对现在(now)的情况的假设，故用would tell形式。
46.C. 47.C. 48.C.
49.B.would rather引导的虚拟语气其谓语用过去式。
50.D.would as soon引导的虚拟语气，其谓语动词也用过去式.
51.B. 52.B. 53.B. 54.B.
55.C.注意单词otherwise引导虚拟语气。
56.C.同上。
57.A.注意词组for fear that
58.A.注意without
Were I Tom，I would refuse.
如果我是汤姆，我会拒绝。
Should it be necessary，I would go.
假若有必要，我会去的。
Had it not been for the bad weather we would have arrived on time.
若不是天气坏，我们就准时到达了。
Should he agree to go there，we would send him there.
要是他答应去的话，我们就派他去了。
Were she here，she would agree with us.
下面重点谈谈虚拟语气在条件句中的用法，虚拟语气条件句是用谓语动词的特殊形式来表示与现在、过去事实相反的情况或对将来发生的情况表示假设。
具体情况如下：
1. 表示与现在事实相反的情况
例如 : If I were you, Id get there earlier. 如果我是你，我就早一点到那儿。（事实是：我不是你，因此我没有早到那儿。）
2． 表示与过去事实相反的情况
例如: If you had worked hard, you wouldnt have failed the exam. 如果你早用功，就不至于考试不及格了。（事实是:你早没用功,所以考试失败了。）
3. 表示与将来事实相反的情况
例如: If it rained tomorrow, our picnic would be put off. 如果明天下雨，我们的野餐就推迟。(事实是：最近天气很好，下雨的可能性不大。)
注意：用虚拟语气表示条件的条件从句, 可以放在主句前，也可以放在主句后，但所表达的意义侧重点不同。主句在前时，强调 “结果”；从句在前时，强调 “条件”。
【巩固练习】
Ⅰ. 单项选择。
( )１. If I were you, I ______ try my best.
A. would B. shallC. hadD. will
( )2. If I ______ ten years younger, I ______ very happy.
A. am; shall beB. were; would be
C. were; shall be D. am; would be
( )3. If I ______to the moon, I would bring something unusual back to the earth.
A. goB. goesC. wentD. will go
() 4. If Jane ______here now, she would explain to us how to do it.
A. beB. is C. wasD. were
() 5. —You can ask your brother for help.
—He is not at home. If he ______, I ______.
A. is; would B. is; will
C. were; wouldD. were; will
Ⅱ. 用动词的正确形式填空。
6. If I ______ ( be ) a teacher, I would not be so strict with my students.
7. If I ______ (have) time, I would come to help you.
8. If she were not so busy, she ______ (come) here with me.
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