诊断练习：
1. ---Do you happen to have twenty dollars on you?
--- ________ ?
---I want to buy a reference book.
A. Want the money B. What to do C. What for D. How much
2. ---What kind of food would you like to have?
--- ________ but Japanese.
---How about Korean, then?
A. Anything B. Something C. Everything D. Nothing
3. ---Why didn't you go to the cinema yester- day?
---I ________ , but my wife returned from France the moment I was leaving.
A. was going to B. will C. did D. had
4. -Good bye! I'm glad _______ you.
- ________ , too.
A. to see; I B. to have seen; Me C. to be seen; Me D. seeing; I
5. ________ we move the picture over there? Do you think it'll look better?
A. What about B. How far C. What if D. How come
6. The river is smooth where ________ .
A. deeply B. deep C. to be deep D. run
7. ---May I take your order?
---Yes, I'd like a cup of coffee, a hot dog and some salad. What about you, Lisa?
---________ .
A. Me, too B. Same again, please C. It's all the same D. The same to me
8. ---I hear Johnson was badly injured in the accident.
--- ________ , let's go and see him.
A. What's more B. If so C. Where possible D. When necessary
9. ---Why didn't you come to Mike's birthday party yesterday?
---Well, I ________ , but I forgot it.
A. would B. must C. should have D. must have
10. I hear Mr. Smith was writing a story last year and he still ________ .
A. do B. does C. is D. am
11. ---I hate talking with that guy. Look, he is coming. What should I do?
---Don't speak until ________ .
A. speaking B. spoken to C. spoken D. speaking to
12. ---Why do you want the book so much?
--- ________ , sir.
A. Studying B. Studies C. Studied D. To study
13. ---How are you getting on with your work?
---Oh, I'm sorry. Things aren't going so well as ________ .
A. plans B. planning C. planned D. to plan
14. I wonder why you won't do it as ________ . It's the third time you have done so.
A. told to B. be told C. told you D. you told
15. ---Are you a teacher?
---No, but I ________ . I worked in a middle school for three years.
A. am B. will C. do D. was
16. The dying old man opened his mouth as if ________ something.
A. to say B. saying C. to have said D. was saying
17. This is an illness that can result in total blindness if ________ .
A. to leave untreating B. left untreated C. leaving untreating D. is left untreated
18. He is rather difficult to make friends with, but his friendship, ________ is more true than any other.
A. once gained B. when to gain C. after is gained D. while gaining
19. ---I didn't do well in the last English test. How about you?
--- ________ .
A. I'll do better next time B. I like English, though C. A lot better D. Even worse
20. ---You seem to have lost your way. ________ ?
---I'm looking for Wangfujing Street .
A. What for B. Need help C. Why so D. Where to
21. ---Which would you like, chicken or fish?
--- ________
A. I don't think so. B. What if? C. Both. D. Neither can I.
22. You may take them all home ________ .
A. if possible B. if can C. unless so D. even if you can
23. ---Hello, may I speak to Bill, please?
--- ________ .
A. Bill speaking B. That's Bill C. Speaking to Bill D. I'm speaking
24. ---I think you look very nice in the red dress.
--- ________ .
A. Oh, no, not nice at all B. Glad you think so C. Don't like red D. You are kind, indeed
25. ---I'm so tired, working all morning on the farm.
---Why not take a rest, then?
---________ .
A. Because I can't afford it B. Maybe I should C. I don't know D. Sorry, I can't tell you
26. If you go to the West Lake in Hangzhou , you'll find it more attractive than commonly ________ .
A. supposing B. to suppose C. supposed D. is supposed
27. Doctors have said that as many as 50% of patients don't take medicine ________ .
A. like directed B. to be directed C. as directed D. so that directed
28. The man stopped from time to time ________ whether he was being followed.
A. as if found B. as to find C as if to find D. when found
29. To tell the truth, I won't go to the party ________ .
A. so as to invite B. even if invited C. if inviting D. if invite
30. Water, ________ enough, can change into vapor quickly
A. when heated B. heating C. though to be heated D. when is heated
基本用法及常见考点：
省略在英语运用中，尤其是在交际对话中普遍存在，因为它可以避免重复，突出关键词语，能做到言简意赅，并使上下文紧密连接。在历年的高考题中也屡见不鲜。省略有词法上的省略，也有句法上的省略，有的学者把某些替代也看作一种省略。
一、词法上的省略
1. 名词所有格后修饰的名词在以下情况可以省略
1）如果名词所有格修饰的名词在前文已出现，则可以省略。如：
These are John's books and those are Mary's (books). 这些是约翰的书，那些是玛丽的书。
2）名词所有格后修饰的名词如果是指商店、住宅等地点时，这些名词也常常省略。如：
at the doctor's 在诊所
at Mr. Green's 在格林先生家
to my uncle's 到我叔叔家
at the barber's 在理发店
2. 冠词的省略
1）为了避免重复
The lightning flashed and thunder crashed. 电闪雷鸣。（thunder前省略了定冠词the）
2）在the next day (morning, week, year...)等短语中，有时为了使语气紧凑定冠词the 常可以省略。如：
We went to the farm to help the farmers with the harvest (the) next day. 第二天，我们去农场帮助农民收庄稼。
3）在副词的最高级前面的定冠词常可以省略。如：
She sings best in the class. 她在班上唱歌唱得最好。
4）在某些独立主格结构中。如：
Our teacher came in, book in hand. (=Our teacher came in, with a book in his hand.) 我们的老师手里拿着一本书进来了。
5）在as引导的让步状语从句中，当作表语的单数名词提前时，不定冠词要省略。如：
Child as he is, he knows a lot. 虽然他还是一个孩子，却懂得很多。
3. 介词的省略
1）both 后常跟of短语，其后可以接名词复数形式，也可以接代词宾格复数形式。接复数名词时，介词of可以省略，但接代词宾格时，of不能省略。如：
Both (of) the films were interesting. 这两部电影都很有趣。
She invited both of us to her birthday party. 她邀请我们俩去参加她的生日派对。
2）在现在完成时表持续和重复的句型中，一段时间前的介词for可以省略。如：
These shoes are worn out. They have
lasted (for) a long time. 这双鞋穿破了，已经穿了很长一段时间了。
3）被动结构中，如果没有必要强调动作的执行者，则可以省略介词by短语。如：
The letter was posted (by me) yesterday. 这封信是昨天寄出去的。
4）和一些动词搭配构成的短语中的介词，如：consider... (as)..., prevent / stop... (from)doing..., have trouble / difficulty... (in) doing...,spend... (in / on) doing... 等中的介词可以省略。如：
Trees can prevent the earth (from) being washed away. 树能阻止泥土被冲走。
Can you stop him (from) going swimming in the river? 你能阻止他下河洗澡吗？
I have some difficulty (in) answering the question. 回答这个问题我有点困难。
4. 动词不定式中的省略
1）有些动词，如：believe, find, think, feel, consider, imagine, prove等后作宾补的结构to be + n. / adj. 中的to be可以省略。如：
I consider him (to be) lazy. 我认为他懒。
His mother found him (to be) a clever boy. 他母亲发觉他是一个很聪明的孩子。
2）感官动词see, hear, feel, watch, notice 等以及使役动词let, make, have后作宾补的动词不定式中的不定式符号to要省略，但变为被动结构时，to必须保留。如：
They made the boy go to bed early.他们强迫这个男孩早睡。
The boy was made to go to bed early. 这个男孩被迫早睡。
注：help后作宾补的动词不定式中的to可以省略也可以保留。
3）在can not but, can not choose but, can not help but之后的动词不定式一般不带to； but之前有实义动词do的某个形式do, does, did, done 时，也不带to, 否则要带to。如：
We have nothing to do now but wait. 我们现在除了等没有别的事可做。
I can not but admire his courage. 我不能不钦佩他的勇敢。
He has no choice but to accept the fact. 除了接受这个事实他别无选择。
4）在并列结构中为了避免重复。如：
I'm really puzzled what to think or say. 我真不知道该怎么想，怎么说才好。
但两个不定式有对照或对比的意义时，则后一个to不能省略。如：
I came not to scold but to praise you. 我来不是责备你，而是赞美你。
5）在why, why not 引导的特殊问句中后跟省略to的动词不定式。如：
Why talk so much about it? 为什么大谈这个事呢？
Why not try it again? 为什么不再试一试呢？
6）动词不定式中动词原形部分是否省略，主要看句子前面是否已出现过同样的动词。如果句子前面出现过同样的动词，为了避免重复，句子后面的不定式常省略动词原形，而保留不定式符号to。如：
They may go if they wish to(go). 如果他们想去，他们就可以去。
Don't go till I tell you to.直到我告诉你去，你才可以去。
在一些动词afford, agree, expect, forget, mean, pretend, remember, want, refuse, hope, wish, would like (love), try等后跟动词不定式作宾语，不定式中的to可以承前（后)省略。如：
-Will you go to the cinema with me? 你愿和我一起去看电影吗？
-Well, I'd like to (go with you). 我愿意。
I would do it for you, but I don't know how to (do it for you). 我想为你做这事，但我又不知如何做。
在某些形容词，如：afraid, glad, willing, happy, eager等后承前省略动词原形，只保留不定式符号to。如：
-Will you join us in the game? 你愿和我们一起做这个游戏吗？
-Sure, I'll be glad to(join you in the game). 当然，我愿意。
有些动词，如：tell, ask, allow, expect, force, invite, permit, persuade, order, warn, wish, would like, forbid 等后跟动词不定式作宾语补足语、主语补足语时，不定式承前省略动词原形，保留动词不定式符号to。如：
He didn't come, though we had invited him to (come). 尽管我们邀请他来，他却没来。
注：承前省略的动词不定式如果有助动词have或be，则要保留be或have。如：
-Are you a teacher? 你是老师吗？
-No, but I used to be (a teacher). 不，我以前是。
二、句法中的省略
在一些简单句、并列句和复合句中，可以省略主语、谓语、宾语、表语等某一个句子成分，也可以省略多个句子成分。
1． 简单句中的省略
１）感叹句中常省略主语和谓语。如：
What a hot day (it is)!多热的天啊！
How wonderful!多妙啊！
２） 在一些口语中可以省略某些句子成分。如：
-（Will you） Have a smoke? 你抽烟吗？
-No. Thanks. 不，谢谢了。
（Is there）Anything else to say?还有别的要说吗？
2． 并列句中的省略
1） 如果主语不同，而谓语动词中的一部分相同，则省略谓语动词中相同的那部分。如：
John must have been playing football and Mary (must have been) doing her homework. 约翰一定在踢球，而玛丽一定在做作业。
2） 主语相同，谓语动词也相同，则二者都可以省略。如：
His suggestions made John happy, but (his suggestions made) Mary angry.他的建议使约翰高兴，却使玛丽很生气。
3） 主语相同，而谓语不同，则可以省略主语。如：
Old McDonald gave up smoking for a while, but (he) soon returned to his old ways. 老麦克唐纳戒了一阵子烟，可很快又抽上了。
4） 在并列复合句中，如果that从句从属于第二个并列句且它的谓语动词和宾语等其它一些成分与第一个并列句相同时，这个that从句通常可以省略这些相同的部分。如：
Jack will sing at the party, but I know John won't （sing at the party）. 杰克将在晚会上唱歌，但我知道约翰不会在晚会上唱歌。
3． 复合句中的省略
1） 名词性从句中的省略
（1）作宾语的what从句中的谓语动词与主句的相同，则what从句可以省略谓语，甚至主语。如：
Someone has used my bike, but I don't know who (has used it). 有人用了我的自行车，但我不知道是谁。
He has gone, but no one knows where (he has gone). 他走了，但没人知道他去哪儿了。
（2）有时候也可以根据说话的情景来省略主句中的一些成分。如：
（I'm） Sorry I've kept you waiting so long.对不起，让你久等了。
（3）在某些表虚拟语气的主语从句、宾语从句、表语从句和同位语从句中，从句谓语动词中的助动词should可以省略。如：
It's important that we (should) speak to the old politely. 我们对老人说话要有礼貌，这很重要。
2） 定语从句中的省略
（1）在限制性定语从句中，作宾语的关系代词that, which, who (whom)常可以省略。如：
The man(who / whom) I saw is called Smith. 我见到的那个人名叫史密斯。
Where is the book (which) I bought this morning? 今天上午我买的那本书在哪儿？
（2）关系副词when, where, why以及that在the time(day, morning, afternoon, evening, night, week, month, year等) when, the place(desk, table, room, spot, house, town, country, school等)where, the reason why, the way that结构中引导限制性定语从句时，在非正式场合下，可以省略关系副词when, where, why, that。如：
I shall never forget the day (when) we first met. 我永远也不会忘记我们第一次见面的那一天。
The reason (why) he came so early is his own affair. 他来这么早是他自己的事。
The way (that) you answered the questions was admirable. 你回答这些问题的方式令人钦佩。
3）状语从句中的省略
当状语从句中的主语和主句的主语一致，或状语从句中的主语是it，并且又含有be动词时，常可以省略从句中的主语和be动词。
（1）在as, before, till, once, when, while等引导的时间状语从句中。如：
While（I was） waiting, I was reading some magazines. 我一边看杂志，一边等。
（2）在though, although,等引导的让步状语从句中。如：
Though (they were) tired, they went on working. 虽然他们累了，但他们仍继续工作。
（3）在if, unless(=if... not)等引导的条件状语从句中。如：
You shouldn't come to his party unless (you were) invited. 除非你被邀请，否则你不应该来参加他的宴会。
（4）在as, as if, as though引导的让步状语从句中。如：
He did as (he had been) told. 他按照被告知的那样去做了。
He paused as if (he was) expecting her to speak. 他停下来，好像是在期待她说话。
（5）在as(so)... as..., than引导的比较状语从句中。如：
I know you can do better than he (can do). 我知道你能比他做得更好。
This car doesn't run as fast as that one (does). 这辆小车不及那辆跑得快。
三、替代性省略
在一些交际用语中的某些动词，如：think, suppose, expect, believe， guess等后常常和so， not等连用，以替代上文出现的内容。如：
-Do you suppose he is going to attend the meeting? 你认为他会来参加这个会议吗？
-I suppose not. 我认为不会。
高考题链接及能力拓展训练：
一、 在含有状语从句的复合句中
1. When first ________ to the market, these products enjoyed great success. (NMET 2004全国卷II)
A. introducing B. introduced C. introduce D. being introduced
2. It shames me to say it, but I told a lie when ________ at the meeting by my boss. (NMET 2004全国卷IV)
A. questioning B. having questioned C. questioned D. to be questioned
3. The man we followed suddenly stopped and looked as if ________ whether he was going in the right direction. (NMET 2003 安徽春)
A. seeing B. having seen C. to have seen D. to see
4. Generally speaking, ________ according to the directions, the drug has no side effect. (NMET2003上海卷)
A. when taking B. when taken C. when to take D. when to be taken
5. Unless ________ to speak, you should remain silent at the conference. (NMET 2003上海春)
A. invited B. inviting C. being invited D. having invited
6. When ________ , the museum will be open to the public next year. (NMET 2002上海春)
A. completed B. completing C. being completed D. to be completed
7. Though ________ money, his parents man-aged to send him to university. (NMET 2002上海卷)
A. lacked B. lacking of C. lacking D. lacked in
8. The research is so designed that once ________ nothing can be done to change it. (NMET 2002)
A. begins B. having begun C. beginning D. begun
二、在限定性定语从句中
9. -You 're always working. Come on, let's go shopping.
- ________ you ever want to do is going shopping. (NMET 2002北京、安徽、内蒙古春)
A. Anything B. Something C. All D. That
10. Is this the reason ________ at the meeting for his carelessness in his work?(NMET 2002上海春)
A. he explained B. what he explained C. how he explained D. why he explained
11. What surprised me was not what he said but ________ he said it. (NMET 2004湖北卷)
A. the way B. in the way that C. in the way D. the way which
12. It is easy to do the repair. ________ you need is a hammer and some nails. (NMET 2004天津卷)
A. Something B. All C. Both D. Everything
13. That's an unpleasant thing to say about your father after ________ he's done for you. (NMET 2004全国卷)
A. something B. anything C. all D. that
三、 在感官动词或短语中
(如:在see，watch，hear，feel，observe，notice，listen to等感官动词或短语及make，have，let等使役动词之后的"宾语+不定式作宾语补足语" 结构中，不定式前省略to；有时为了避免重复，常省略与上文表达相同意思的不定式符号to之后的内容，只保留不定式符号；不定式在tell，ask， advise， wish， permit， force等动词后面作宾语补足语或主语补足语时，可以省略，但要保留不定式符号to；不定式在happy，glad，eager，ready，willing等形容词后面作状语时，可以省略，但要保留不定式符号to。)
14. As you've never been there before, I'll have someone ________ you the way. (MET 1990上海卷)
A. to show B. show C. showing D. showed
15. -I'll be away on a business trip. Would you mind looking after my cat?
-Not at all, ________ . (NMET 1995)
A. I have no time B. I'd rather not C. I'd like it D. I'd be happy to
16. -Does your brother intend to study German?
-Yes, he intends ________ . (NMET 1998上海卷)
A. / B. to C. so D. that
17. -Would you like to go to the Grand Theatre with me tonight?
- ________ . (NMET 1999上海卷)
A. Yes, I'd like to go to the Grand Theatre B. I'd like to, but I have an exam tomorrow
C. No, I won't D. That's right
18. -You should have thanked her before you left.
-I meant ________ , but when I was leaving I couldn't find her anywhere. (NMET 2000北京春招卷)
A. to do B. to C. doing D. doing to
四、 在if引导的虚拟条件句中
19. ________ it rain tomorrow, we would have to put off the visit to the Yangpu Bridge . (NMET 1994上海卷)
A. Were B. Should C. Would D. Will
20. ________ for the free tickets, I would not have gone to the films so often. (NMET 1995上海卷)
A. If it is not B. Were C. Had it not been D. If they were not
五、 在否定结构中
21. I will know what was on his mind at the time, nor will ________ . (NMET 2004 江苏卷)
A. anyone B. anyone else C. no one D. no one else
22. Of the making of good books there is no end; neither ________ any end to their influence on man's lives. (NMET 2004 广东卷)
A. there is B. there are C. is there D. are there
23. -I would never come to this restaurant again. The food is terrible!
- ________ . (NMET 2004全国卷III)
A. Nor am I B. Neither would I C. Same with me D. So do I
