2.用在lest, for fear that和in case引导的状语 从句中，这时谓语动词用should+动词原形 或动词原形。
She closed the windows lest she catch cold.
六、几种特殊的虚拟语气
1) 虚拟倒装句 1.Were it (=If it were) not for their help,we couldn’t have
5) 比较if only与only if only if 表示“只有”； I wake up only if the alarm clock rings. if only 则表示“如果……就好了”。其从句中的谓语 动词用过去时或过去完成时。
高考英语语法专题复习系列课件
虚拟语气
一、非真实条件句中的虚拟语气 二、宾语从句中的虚拟语气 三、主语从句中的虚拟语气 四、表语从句、同位语从句中的虚拟语气 五、状语从句中的虚拟语气 六、几种特殊的虚拟语气
考题点击：
1. I am not free today. If I _B__free today , I __ and
1.三、主语从句中的虚拟语气 基本句型： 1. It be+过去分词+that…+(should)+动词原形+… 过去分词：suggested, requested, ordered, proposed…
It is required that nobody (should) smoke here. It’s suggested that everybody (should) buy a dictionary. 2. It be+形容词+that…+(should)+动词原形+…
had + would +have+过去分词 过去分词 could +have+过去分词
去
might +have+过去分词
3.和将来的事实相反
时态 从 句
主句
表 示 将 来
1)were to
should+动词原形
+动词原形 would +动词原形
2)should
could +动词原形
+动词原形 might +动词原形
形容词:important, necessary, natural, right, wrong, better,
proper, funny, strange, surprising…
It is necessary that we (should ) have a walk now.
It's important that we (should) take good care of the patient. 3. It be+名词（ a pity/a shame/ no wonder） that…
C. asked him … know
D. had asked … would know
3) 介词短语表条件 But for your help, we couldn’t have succeeded. Nothing could live without the sun.
考题点击：
Without your help, we __D__ such rapid progress.
What would have happened, ___C__ as far as the river bank?
(01 上海) A. Bob had walked farther B. if Bob should walk farther C. had Bob walked farther D. if Bob walked farther
+ (should)+动词原形+…
考题点击：
1. His suggestion that you __A___ once more sounds
reasonable. A. try B. tries C. must try D. can try
2.He gave an advice that they __C__ each other.
注意: suggest表 暗示表明 时 insist表坚持认为时
不用虚拟语气
He ordered that the students (should) wash the clothes every week by themselves.
The doctor suggested that she (should) have an
I wish you had written to him. 3)与将来事实相反 : wish + would/could/might+do
I wish he would forgive me.
2. 在某些动词后的宾语从句中需用should+动词原形的 虚拟语气形式。“should”可以省略。 常见的动词有:一个坚持insist; 两个命令order, command ; 三条建议suggest , advise, propose; 四项要求demand, request, require, ask; 另外有:prefer
C. would , ask
D. did, ask
一、非真实条件句中的虚拟语气
1.和现在的事实相反
时态 从 句
主句
表 示
过去时
should+动词原形 would +动词原形
现 (be---were) could +动词原形
在
might +动词原形
2.和过去的事实相反
时态 从 句
主句
表 示 过
should+have+过去分词
A. may explore B.exploded
C. explode
D.had explode
五、状语从句中的虚拟语气
1、用在由as if,as though引导的状语从句中，表示 和现在事实相反或对现在的怀疑，用过去时；表 示过去想象中的动作或情况，用过去完成时;表示 将来用would + 动词原形。 It seems as if the man were his brother. This device operated as though it had been repaired.
have left the meeting so early. 考题点击：
I went by plane; otherwise I __D__ much longer time.
A.could take B.would take C.will have taken D.would have taken
operation at once.
1. 考题点击：
2. Is it necessary that he __D___ the
examination?
A. takes
B. has to take
C. must take D. take
2. It is strange that he __B___ you this.
考题点击：
1. We felt as if we ___C__ each other for years.
A.knew
B.were knowing
C.had known D.have knowing
2. He took away the oxygen tank for fear that
it __C____.
got over the difficulties. 2.Had I (=If I had) known about it,I would have told you. 3.Should anyone (=If anyone should )call,please take
a message. 考题点击：
A. couldn’t make B. wouldn’t make C. will not have made D. wouldn’t have made
4) 情境中提供虚拟语气 Suppose there were no gravity, objects would not fall to the ground when dropped. She wasn’t feeling very well. Otherwise she wouldn’t
2) 错综条件句
If you hadn’t bought the ticket last week, how would you go now?
考题点击：
If you _____ him yesterday, you __D___ what to do now.
A. asked … would know B. had asked … would have known
3)动词过去式
1.考题点：
1.I went to bed early last night,but I wish I B so.
A. didn’t do
B. hadn’t done
C.haven’t done D. couldn’t do
2.How I wish every family _B___a large house
with a beautiful garden.
A.has B.had C.will had D.had had
3. The teacher ordered that students__B_____.
A. mustn’t smoke B. not smoke