发布时间 : 星期二 文章GCT英语更新完毕开始阅读c0271c1a59eef8c75fbfb34f
If I were you, I would go to look for him. If he were here, everything would be all right. 2.混合条件句
主句与从句的动作发生在不同的时间，这时主，从句谓语动词的虚拟语气形式因时间不同而不同，这叫做混合条件句。
例如：条件句动作发生在过去，主句的动作发生在现在)谓语动词要根据表示的时间进行调整。
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3.虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。
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4虚拟语气的其他用法 （1）it is (was) important(necessary, desirable, imperative, advisable)that句型中需要虚拟语气。如：It is
important that we should speak politely. __________________________ (2) wish引导的宾语从句
如：we wish you had come to our party yesterday.
____________________________________________________________________________ （3） 当主句中出现下列单词表示要求、建议、命令、愿望、介绍、推荐以及表示重要性的动词、名词、形容词时，其
后从句中的谓语动词要用虚拟语气，虚拟的形式为：动词原形或者should+动词原形： v.
ask, advise, beg, command, decide, decree, demand, direct, deserve, desire, insist（坚决要求）, maintain,
move, order, prefer, propose, recommend, require, request, resolve, stipulate, suggest（建议）, urge,
vote等。注意：当insist作“坚持认为”解、suggest作“表明；暗示”解时，其宾语从句中的谓语动词为陈述语气。
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I suggest that you (should) not be late again next time.
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以上动词转化为名词(如：advice, aim, decision, decree, demand, desire, idea, importance, insistence,
instruction, motion, necessity, order, plan, preference, proposal, recommendation, regulation,
requirement, request, resolution, suggestion,等)后接同位语从句或表语从句时，从句要求用虚拟语气，其谓语部
分用“(should)+ 动词原形” (should可省略)。
We are all for your proposal that the discussion be put off.
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以上动词转化为形容词advisable, anxious, appropriate, best, better, compulsory, crucial, demanded,
desirable, desired, determined, eager, essential, imperative, important, impossible, necessary,
obligatory, only right, ordered, preferable, possible, proper, pity, recommended, requested, required,
strange, suggested, urgent, vital等。
It was essential that the application forms be sent back before the deadline. It is requested that a vote be taken.
(4) it is time that句型 如：It is time we left. It is time we went to bed. 练习：
1 It's a great pity that he__so careless.
A was B will be C should be D can be 2 Even if I__with you then, I__must for you.
A would be; would not do B were; should not have done C had been; would not do D had been; should have done 3 __, I would not refuse his invitation.
A Were I you B If I should be you C If I was you D If I had been you 4 The whole family greeted me as though I__a member of the family.
A am B were C would D should be 5 __, everything would have been all right.
A He had been here B Here he had been C Been here he had D Had he been here 6 __, man could not live at all.
A Were it not for the sun B If it was for the sun
C Had it not been for the sun D If it shouldn't be for the sun 7 Their suggestion that she__till next month is reasonable.
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A wait B are waiting C will wait D would wait 8 If there were no subjunctive mood, English__much easier.
A will be B would have been C could have been D would be 9 If she had worked harder, she__.
A would succeed B had succeeded C should succeed D would have succeeded 10 --The experiment had failed. --I suggest you__again.
A try B trying C will try D would try 11 When a pencil is partly in a glass of water, it looks as if it__.
A breaks B had broken C were broken D had been broken 12 We__the task on time without your help.
A hadn't had finished B didn't have finished C can't have finished D couldn't have finished 13 If only I__as tall as you are!
A be B am C were D being 14 Should it rain, the flowers__.
A will be saved B would be saved C had been saved D would have been saved 15 It is important that we__wild animals.
A will protect B should protect C shall protect D are protecting 16 I'd rather you__make any comment on the issue for the time being.
A don't B wouldn't C didn't D shouldn't 17 We are all for your proposal that meeting__.
A be put off B was put off C should put off D is to put off 18 If I hadn't stood under the ladder to catch you when you fell, you__ now.
A couldn't have smiled B wouldn't be smiling C didn't smile D won't smile 19 If the whole operation__before hand, a great deal of time and money would have been lost A was not planned B has not been planned C had not been planned D were not planned
20 As Commander-in-Chief of the armed forces, I have directed that all measures__for our defense. A had
been taken B would be taken C be taken D to be taken
第八讲.情态动词 一、 can, could
1) 表示能力（体力、知识、技能）。
________________________________________________________________________ 此时可用be able to代替。Can只有一般现在时和一般过去式；而be able to则有更多的时态。 I’ll not be able to come this afternoon.
当表示“经过努力才得以做成功某事”时应用be able to，不能用Can。如：
_________________________________________________________________________ 2) 表示请求和允许。 -----Can I go now?
----- Yes, you can. / No, you can’t.
此时可与may互换。在疑问句中还可用could,
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might代替，不是过去式，只是语气更委婉，不能用于肯定句和答语中。 ---- Could I come to see you tomorrow? ---- Yes, you can. ( No, I’m afraid not. )
3) 表示客观可能性（客观原因形成的能力）。 This hall can hold 500 people at least.
________________________________________________________________________ 4) 表示推测（惊讶、怀疑、不相信的态度），用于疑问句、否定句和感叹句中。 Can this be true?
This can’t be done by him. How can this be true?
二、 may, might
1) 表示请求和允许。might比 may语气更委婉，而不是过去式。否定回答时可用can’t 或mustn’t，表示“不可以，禁止”。 ----Might/ May I smoke in this room? ---- No, you mustn’t.
---- May/Might I take this book out of the room? ---- Yes, you can. (No, you can’t / mustn’t. )
用May I...？征徇对方许可时比较正式和客气，而用Can I...？在口语中更常见。 2）用于祈使句，表示祝愿。
_________________________________________________________________________ 3) 表示推测、可能性（不用于疑问句）。
might不是过去式，它所表示的可能性比may小。 1．He may /might be very busy now.
2．Your mother may /might not know the truth. 三、 must, have to 1) 表示必须、必要。 You must come in time.
在回答引出的问句时，如果是否定的，不能用mustn’t（禁止，不准），而用needn’t, don’t have to（不必）.
_________________________________________________________________________ 2) must是说话人的主观看法， 而have to则强调客观需要。Must只有一般现在时， have to 有更多的时态形式。
1． he play isn’t interesting, I really must go now. 2． I had to work when I was your age.
3) 表示推测、可能性（只用于肯定的陈述句）
1． You’re Tom’s good friend, so you must know what he likes best. 2． Your mother must be waiting for you now. 四、 dare, need
1) dare作情态动词用时, 常用于疑问句、否定句和条件从句中, 过去式形式为dared。 1． How dare you say I’m unfair?
2． He daren’t speak English before such a crowd, dare he?
________________________________________________________________________ 2) need 作情态动词用时, 常用于疑问句、否定句。在肯定句中一般用must, have to, ought to, should代替。
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