求高中英语虚拟语气的全部用法

高中英语虚拟语气用法总结(要详细的，急用)

but for 要不是，如果没有
if only... 要是…就好了
needn't have done 表示：过去不必做其事，但事实上做了
must have done 一定是…（对过去非常肯定的猜测）
can't have done 不可能
couldn't have done 不可能已经...
could have done 本来应该
should have done 本来应该
shouldn't have done 本来不应该
would have done 本来会
wouldn't have done 本来不会
might have done 可能已经
might not have done 可能没有

一.概念: 动词虚拟语气表示说话人的愿望, 假设, 猜测, 建议, 请求, 意图, 设想等未能或不可能成为事实的情况, 或者在说话人看来实现可能性很小的情况, 而不表示客观存在的现实

二.虚拟语气的表现形式: 通过句中谓语动词的特殊形式来表现. 这些特殊形式与谓语动词的某些时态相同, 但它们只表示语气, 而不表示时态, 但含有一定的时间概念

虚拟语气的用法

一.虚拟语气在简单句中的用法: 谓语动词用原形或may +动词原形

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 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.

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.

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), 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(包括同位语从句和表语从句等)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.

八.虚拟语气用在句型: It is 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.

c. I would rather that he painted the house blue

1、在错综条件句子中，虚拟条件从句和主句动作发生的时间不一致，因此，主句和从句的谓语动词应根据所指的时间选用适当的虚拟语气形式。例如：　　1)If I were you,I wouldn't have missed the film last night.如果我是你，我就不会错过昨天晚上的那部电影。(从句与现在事实相反，主句与过去事实相反。) 　　2)If he had followed the doctor's advice,he would recover already.如果他遵照医生的劝告，现在病就好了。(从句与过去事实相反，主句与现在事实相反。) 　　2、在if虚拟条件句中，有时可把连词省去，采用倒装语序把谓语动词were或助动词did,had,should移到句首构成非真实条件从句的另一种句型，其意思不变。例如：　　1)Had we time to spare,we would be glad to go to the park.如果能抽出时间，我们很乐意逛公园。　　2)Were it not for the discovery of electricity,the modern world would experience great inconveniece.假如没有发现电，现代世界将很不方便。　　3、有时假设的情况不用if引导虚拟条件从句来表述，而用介词(如without, but for等)引出的短语、分词(如supposing等)引出的短语、并列连词(如or,otherwise,but,though等)、由动词suppose引出的祈使句或通过上下文的意思来表达。此时句中谓语动词仍采用虚拟语气的相应形式。例如：　　1)But for your advice,I would not be able to do this work.要不是你的劝告，我是不会做这份工作的。　　2)Victor obviously doesn't know what's happened,otherwise he wouldn't have made such a stupid remark.显然维克多不知道发生了什么事情。不然的话，他就不会说这样愚蠢的话了。　　4、在一些表示愿望、建议、请求、命令等含义的动词后面的宾语从句中，谓语动词用动词原形或"should＋动词原形"表示虚拟语气。这类动词有ask,demand, insist,order,propose,move,desire,require等。例如：　　1)They demanded that the aggressor troops(should)be withdrawn immediately.他们要求立即撤出侵略军。　　2)I moved that he(should)be discharged for his serious mistake.我建议，由于他犯有严重错误，应解除他的职务。　　5、在"would(had)rather(would sooner,would as soon)＋宾语从句"句型中，要求后面的宾语从句用虚拟语气。但这种虚拟语气表示的不是与事实相反的假设，而是一种尚未实现的愿望，其从句谓语动词用一般过去时。例如：　　1)I would rather you came next Friday.我希望你下周五来。　　2)I'd just as soon you didn't speak rudely to her.我真希望你别对她那么粗鲁地讲话。　　6、在和idea,necessity,plan, motion,order,proposal,recommendation,suggestion,under- standing等词有关的同位语或表语从句中，谓语动词用动词原形或"should＋动词原形"表示虚拟语气。例如：　　1)M y idea is that the group(should)hold another session to discuss the problem.我的意见是小组召开另一次会议来讨论这个问题。　　2)Emphasis is laid on the necessity that all the objectives to be attained be taken into account before starting a new project.我们强调在开始制定一个新的计划之前，必须把要达到的所有目标都考虑进去。　　7、在某些"It is＋形容词＋that..."句型中，如"It is important(necessary,essential, natural,desirable,unusual,pity,strange)that..."，that所引导的主语从句中谓语动词均用动词原形或"should＋动词原形"来表示虚拟语气。例如：　　1)It is highly desirable that a new president be appointed for this college.人们迫切地希望能给这个学院派一个新院长。　　2)It is strange that the girl(should)be so arrogant.真奇怪，这个女孩竟会如此傲慢。　　8、在"It is ordered(suggested,demanded,moved,planned等)＋that..."这个句型中，that引导的主语从句要用虚拟语气形式，谓语动词用动词原形或"should＋动词原形"。例如：　　1)It is moved that Lucy give a performance at the party.有人提议露茜在晚会上表演一个节目。　　2)It was suggested that more teachers 　　(should)be sent there to help them.有人建议派更多的老师去那儿帮助他们。　　9、as if /though可以引出一个状语从句也可以引出一个表语从句。当as if／though跟在be，feel，look，seem，sound等系动词之后时，引导的是表语从句；如果主句的谓语动词不是联系动词be等，as if／though引导的则是方式状语从句。无论是哪种类型的从句，只要从句的内容是不真实的，都必须用虚拟语气。当从句表示与现在的事实相反，谓语动词用一般过去时；表示与过去事实相反要用"had＋过去分词"；表示与将来可能相反的则用"would(could，might)＋动词原形"。例如：　　1)I feel as if I were going to faint.我感到我像要昏过去似的。(与现在事实相反的表语从句) 　　2)She cried as if her heart could be broken.她哭的好像心都要碎了。(与将来可能相反的主语从句) 　　10、在It is(about /high)time引导的定语从句中，也可以根据需要使用虚拟语气，用以表示"(此刻)该做……而没有做"的意思，其谓语动词用过去时或"should＋动词原形(用should时，不能将其省略)"。例如：　　1)It is time I should leave.我该走了。　　2)It is about time that you got(should get) dressed.你该穿衣服了。　　11、if only引导的是省略了表示结果的主句的虚拟结构，现在已成为惯用法，表达愿望。从句用过去时表示现在没有实现的愿望；对过去没有实现或不能实现的愿望，从句就用过去完成时。这类句型表示一种不真实的条件，常译成"要是……就好了！"例如：　　1)If only I had taken mother's advice.我要是听取妈妈的建议就好了。　　2)If only I could speak several foreign languages.我要是能讲几种外语就好了。　　12、在以in order that,so that,lest引导的目的状语从句中，谓语动词一般用虚拟语气。从句中的谓语动词用"may(might)＋动词原形"或"should＋动词原形"。在以lest引导的从句中，谓语动词用"should＋动词原形"。例如：　　1)She stayed at home for a few days so that she might take care of her sick mother.她在家里呆了好几天，以便能照顾生病的母亲。　　2)The teacher explained the sentences again and again in order that the students could understand them clearly.老师一再解释这些句子以便学生能够清楚地理解。

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