(1)用来代替动词不定式后被省略的动词，常在be afraid, glad, happy, expect, forget, hope, intend, like, love, mean, prefer, refuse, seem, try, want, wish等的后边。
I asked him to see the film, but he didn't want to. 我请他去看电影，但他不想去。
—Will you join in the game？——你愿意加入做游戏吗？ —I'd be glad to.——我很高兴加入。
(2)如果不定式中含有be, have, have been，通常保留be, have和have been。 —Are you a sailor？——你是海员吗？ —No, but I used to be.——不，但我过去是。 【易错点点睛】
易错点点睛 1 强调句的正确运用
1. It wasn’t until nearly a month later __ I received the manager’s reply. A. since B. when C. as D. that 2. It was __ back home after the experiment. A. not until midnight did he go B. until midnight did he go C. not until midnight that he went D. until midnight when he didn’t go
3. It was in the classroom __ was built by the local government they finished their homework. A. where; that B. that; that C. that ;where D. where; where
5. It was on september 1 st he became a member of our school. A. when B. that C. / D. till 【特别提醒】
使用强调句时，应该注意如下几点:
1.强调状语:It is tomorrow that will hold the meeting.(that不能换成when)
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It was on the sports ground that I found (that 不能换成where)
2.强调含有not...util...一结构的句子时，要用 It is／was not until...that...结构。that后的句子要 用肯定句，且须用陈述语序。
3.强调句和主语从句句型(指 “It+be+adj.／n.+that从句”类型)的异同点:二者均有 It be ... that／who...之类的语言标志。所不同的是:
(1)含有主语从句的句子译为汉语时不可加上“正是……”或“就是……”之类的字眼，而强调则可以。 (2)含有主语从句的句子若删掉 It be...that／who...则原句不论结构还是语意均不成立，而强调句去掉结构标志仍然成立。如:It is ture that he once went to to Canada.(不可以去掉 It is及that，否则原句不成立)
It was on December 11，典型例题at China became a member of WTO.(去掉was及that后原句仍然成立)
4.含有定语从句的强调句型:仔细分析出at或 who在句中的作用，若that或who可有可无(结合it be来分析)，则为强调句，否则是定语从句。如:
It was in the lab that was set up by Mr.Smith that they finshed the experiment.(lab后的出at不可省略,因为出at引导定语从句，作该句的主语。句中第二个，that才是强调句的标志。)
5.强调谓语时用“do/does／did+动词原形”。如: He did come yesterday.他昨天的确来了。 【举一反三】
1 It is these poisonous products __ can cause the symtoms of the flu, such as headache and aching muscles.
A. who B. that C. how D. what 2 It was not long __ he was born __ his mother died.
A. before; that B. since; when C. until; when D. after; that
3 It must be he that has stolen Mr. Smiths purse, ? A. hash’t he B. isn’t he C. mush’t it D. isn’t it
4 I have always been honest and straight forward, and it doesn’t matter __ I’m talking to. A. who is it B. who it is C. it is who D. it is whom
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5 Why! I have nothing to confess. __ you want me to stay? A. What is it that B. What it is that C. How is it that D. How it is that 易错点点睛 2 倒装句的正确运用
1. They have a good knowledge of English but little they know about German. A. have B. did C. had D. do
2.I failed in the final examination last term and only then __ the importance of studies. A. I realized B. I had realized C. had I realized D. did I realize 3. Only when the war was over __ hometown.
A. did the soldier return B. the soldier returned C. returned the soldier D. the soldier did return
4. So difficult __ it to live in an Englishspeaking country that I dedermined to learn English well. A. I felt B. have I felt C. I did feel D. did I feel 5.—You forgot your purse when you went out. —Good heavens,__.
A. so did I B. so I did C. I did so D. I so did 【特别提醒】
在下列情况下，句子要完全倒装:
1.在there，here 引导的句子中，谓语是be；exist 等表示状态的词。如:Hereisaseatforyou.Tom. There stands a building on；the top of the mountain
2.在语气词there，here开头的句子中，谓语是 come，be等。 如:There goes the bell!铃响了!
Here comes your husband.你丈夫来了。 There you go again你又来这一套。
3.由副词now,then,thus 引导的句子中，谓语是 come,begin,be 如: Now comes your turn. Thus ended the meeting.
4.在 in, out up, over, back等作状语置于句首时，谓语动词是 come, go, rush, run 等的句子里。
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如:Up and up the prices Off went the horses
5.地点状语提前，谓语是 be ,stand,lie 的句子中 如:In front of the door stood a boy. On the ground lay a sick dog. A. 在疑问句里。
Do you have an English class every day? What did the two cheats pretend to be doing?
在特殊疑问句里，如果疑问词作主语，则不用倒装。 Who is in the next room?谁在隔壁房间？ What makes you so angry? 什么使你这么生气？
B.在以so 开头表示“也一样”，和以nor或neither开关表示“也不一样”的句子里。 I get up at seven and so does my brother. He didn’t do it and neither did I.
C.在以 never, hardly, scarcely, seldom, little, barely , rarely, nowhere, by no means, hot until, hardly (scarcely)... when ,no sooner... than 等否定或半否定意义的词位于句首表示强调的句子里。
Never before have I met him.我以前从未见过他。
Seldom did the boy icad newspapers.这个孩子以前很少读报。
Little do I dream of seeing wonderful seenery.我梦想不到会看到这样神奇的景色。 Not until midnight did it stop raining.雨一直下到半夜才停。
Hardly had he entered the house when it began to rain. 他一进屋就开始下雨了。 No sooner had they got to the plant than they started to wrok.他们一进工厂就开始工作。 【举一反三】
1 Only in this way __ progress in your English. A. you make B. can you make C. you are able to make D. will able to make
2 Nowhere else in the world __ more friendly people than in China. A. you will find B. can you be able to find C. you may have found D. can you find
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