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高中三年级英语

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  • 单选题
    Under no circumstances and at no time ______ be the first  _____ nuclear weapons.
    [     ]

    A. we shall ; using
    B. shall we; to use
    C. shall we ; using
    D. we shall; to use
    本题信息:2012年江苏模拟题英语单选题难度一般 来源:刘婷婷
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本试题 “Under no circumstances and at no time ______ be the first _____ nuclear weapons.[ ]A. we shall ; usingB. shall we; to useC. shall we ; usingD. we s...” 主要考查您对

不定式

部分倒装

等考点的理解。关于这些考点您可以点击下面的选项卡查看详细档案。
  • 不定式
  • 部分倒装

动词不定式的概念:

动词不定式指由to加上动词原形(而且只能是动词原形)所构成的一种非限定性动词,但在有些情况下to可以省略。动词不定式在语法功能上可作主语、宾语、宾语补足语、
表语、定语和状语。


不定式的特殊句型对比:

1、不定式的特殊句型too…to…:
1)too…to 太…以至于…。
例如:He is too excited to speak. 他太激动了,说不出话来。  
        —Can I help you? 需要我帮忙吗?
        —Well, I'm afraid the box is too heavy for you to carryi t, but thank you all the same. 不用了。这箱子太重,恐怕你搬不动。谢谢。
2)如在too前有否定词,则整个句子用否定词表达肯定,too后那个词表达一种委婉含义,意为“不太”。
例如:It's never too late to mend. 改过不嫌晚。(谚语) 
3)当too前面有only, all, but时,意思是:非常…等于very。
例如:I'm only too pleased to be able to help you. 能帮助你我非常高兴。 
            He was but too eager to get home. 他非常想回家。
2、不定式的特殊句型so as to:
1)表示目的:它的否定式是so as not to do。
例如:Tom kept quiet about the accident so as not to lose his job. 汤姆对事故保持沉默是为了不丢掉他的工作。   
            Go in quietly so as not to wake the baby. 轻点进去,别惊醒了婴儿。
2)表示结果:
例如:Would you be so kind as to tell me the time? 劳驾,现在几点了。
3、不定式的特殊句型:Why not:
“Whynot+动词原形”表达向某人提出建议,翻译为:为什么不……?   干吗不……?
例如:Why not take a holiday?


不定式的用法:

1、不定式作补语:
1)有些有动词+宾语+不定式的结构。
例如:advise allow cause challenge command compel drive驱使
enable encourage forbid force impel induce instruct invite like/love order permit make let have want get warn persuade request send tell train urge 等。
例如:Father will not allow us to play on the street. 父亲不让我们在街上玩耍。      
            The officer ordered his men to fire. 长官命令士兵开火。
注意:有些动词如make,have,get,want等可用不定式作做宾补,也可用分词作宾补。现在分词表达主动,也表达正在进行,过去分词表达被动。
2)有些有动词+宾语+不定式的结构,不定式的动词往往是be,不定式一般可以省去。
例如:consider find believe think declare(声称) appoint guess fancy(设想) guess judge imagine know 等。
例如:We believe him to be guilty. 我们相信他是有罪的。 
            We know him to be a fool. 我们知道他是个笨蛋。(tobe不能省去)
典型例题:Charles Babbage is generally considered___the first computer.
                    A. to invent 
                    B. inventing 
                    C. to have invented 
                    D. having invented 
答案:C. 一般没有consider+宾语+be以外不定式的结构,也没有consider+宾语+doing的结构,排除A、B、D。consider用动词be以外的不定式作宾补时,一般要求用不定式的完成式,故选C。 3)有些动词可以跟there+to be的结构。例如:believe expect intend like love mean prefer want wish understand 等。
例如:We didn't expect there to be so many people there. 我们没料到会有那么多人在那里。
            You wouldn't want there to be another war. 你不至于想让另外一场战争发生吧。
2、不定式作主语:
不定式作主语,往往用it作形式主语,真正的主语不定式放至句子的后面。 
例如:It's so nice to hear your voice. 听到你的声音真高兴。
            It's necessary for you to lock the car when you do not use it. 不用车的时候,锁车是有必要的。 
            It's very kind of you to help us. 他帮助我们,他真好。 
            It seemed selfish of him not to give them anything. 他不给他们任何东西,这显得太自私了。
3、不定式作表语:
不定式可放在be动词后面,形成表语。
例如:My work is to clean the room every day. 我的工作是每天清扫房间。  
            His dream is to be a doctor. 他的梦想是成为一名医生。
4、不定式作定语:
不定式做定语通常要放在被修饰的词后,往往表示未发生的动作。
例如:I have a lot of work to do.我有许多事要做。   
            There was nothing to bring home that morning. 那天早上(他回家时)两手空空。
5、不定式作状语:
1)目的状语:常用结构为to do,only to do(仅仅为了), in order to do,so as to do,so(such)...asto…(如此…以便…)。
例如:He ran so fast as to catch the first bus. 他飞快地跑以便赶上第一班车。  
            I come here only to say good-bye to you. 我来仅仅是向你告别。
2)作结果状语,可以表示没有预料到的或事与愿违的结果,不定式要放在句子后面。
例如:I awoke to find my truck gone. 我醒来发现箱子不见了。  
            He searched the room only to find nothing. 他搜索了房间,没发现什么。
3)表原因:
例如:I'm glad to see you.  见到你很高兴。
            She wept to see the sight. 她一看到这情形就哭了。
4)表示理由和条件:
例如:He must be a fool to say so.
            You will do well to speak more carefully.
            You will do well to speak more carefully.


不定式知识体系:

 


不定式用法拓展:

1、用作介词的to:
to可以用作介词,也可用作不定式的标示。下面的to都用作介词:admit to  object to  beaccus to  med to  beused to  stick to  turn to开始 look forward to  be devoted to  pay attention to  contribute to apologize to devote oneself to

2、省去to的动词不定式:
1)情态动词(除ought外)后。
2)使役动词let,have,make后,感官动词see, watch, lookat, notice, observe, hear, listento, smell, feel, find等后。
注意:被动语态中不能省去to。
例如:I saw him dance. 我看见他跳舞。=He was seen to dance.  
           The boss made them work the whole night. 老板让他们整夜干活。 =They were made to work the whole night.
3)would rather,had better句型后:
4)Why…/why not…句型后:
5)help后可带to,也可不带to, help sb(to)do sth:
6)but和except后:
but前是实义动词do时,后面出现的不定式不带to。
比较:He wants to do nothing but go out. 他只想出去玩。  
            He wants to believe anything but to take the medicine. 除了吃这药,他什么都信。
7)由and, or和than连接的两个不定式,第二个to可以省去:
8)通常在discover, imagine, suppose, think等词后作宾补时,可以省去to be。
例如:He is supposed(to be)nice. 他应该是个好人。

3、动词不定式的否定式在不定式标志to前加上not。
例如:Tell him not to shut the window。让他别关窗。 
            She pretended not to see me when I passed by. 我走过的时候,她假装没看见。
4、It's for sb. 和It's of sb. 这样的句子中,由于表语形容词性质的不同,导致了不定式逻辑主语标志用for或of的区别。
1)for sb. 句型中的形容词一般为表示事物的特征特点,表示客观形式的形容词,如easy, hard, difficult, interesting, impossible等:
例如:It's very hard for him to study two languages. 对他来说学两门外语是很难的。
2)of sb句型中的形容词一般为表示性格,品德,心智能力,表示主观感情或态度的形容词,如good, kind, nice, clever, foolish, right。
例如:It's very nice of you to help me. 你来帮助我,你真是太好了。用for还是用of的另一种辨别方法:用介词for或of后面的逻辑主语作句子的主语,用介词前边的形容词作表语,造个句子。如果通顺用of,不通则用for。
例如:You are nice.(通顺,所以应用of)。  
            He is hard.(非所表达的意思,不通,因此用for。)


部分倒装的概念:

倒装英语句子的主语通常位于谓语动词之前,这种语序被称为正常语序。但有时出于修辞或某种特殊的语法结构的需要,需要将谓语动词放在主语之前,这种语序则叫倒装语序。主语和助动词倒置叫部分倒装。


部分倒装:

1、含有否定意义的副词位于句首时的倒装:
在正式文体中,never, seldom, rarely, little, hardly, scarcely, no sooner, no longer, nowhere等含有否定意义的副词若位于句首,则其后要用部分倒装:
如:I shall never forgive him./ Never shall I forgive him. 我永远不会宽恕他。
        He seldom goes out for dinner./Seldom does he go out for dinner. 他很少出去吃饭。
        She hardly has time to listen to music./Hardly does she have time to listen to music. 他几乎没时间听音乐。
        He little realize show important this meetingis./Little does he realize how important this meeting is. 他不甚明白这个会议的重要性。   
        We had no sooner reached the airport than the plane took off./No sooner had we reached the airport than the plane took off. 我们刚到机场,飞机就起飞了。
:(1)对于not…until句型,当not until…位于句首时,其后的主句要用倒装语序:
如:He didn't leave the room until the rain stopped./Not until the rain stopped did he leave the room. 雨停了之后他才离开这房间。
        (2)某些起副词作用的介词短语,由于含有否定词,若位于句首,其后要用部分倒装:
如:On no accounts must this switch be touched. 这个开关是绝不能触摸的。
        In[Under] no circumstances will I lend money to him. 无论如何我也不会再借钱给他了。但是,in no time(立即,马上)位于句首时,其后无需用倒装语序:
如:In no time he worked out the problem. 他马上就算出了那道题。
2、“only+状语”位于句首时的倒装:
当一个状语受副词only的修饰且置于句首时,其后用部分倒装语序:
如:Only then did he realize that he was wrong. 到那时他才意识到他错了。
        Only in this way are you able to do it well. 你只有用这种方法才能把它做好。
        Only when he returned home did he realize what had happened. 当他回到家里时,才知道出了什么事。
3、“so+形容词或副词”位于句首时的倒装:
副词so后接形容词或副词位于句首时,其后用部分倒装:
如:So cold was the weather that we had to stay at home. 天气太冷,我们只好呆在家里。
        So fast does light travel that we can hardly imagine its speed. 光速很快,我们几乎没法像它的速度。
        So sudden was the attack that we had no time to escape. 袭击来得非常突然,我们来不及逃跑。
4、“So+助动词+主语”倒装:
当要表示前面提出的某一肯定的情况也同样适合于后者,通常就要用“So+助动词+主语”这种倒装结构:
如:You are young and so am I. 你年轻,我也年轻。
        She likes music and so do I. 她喜欢音乐,我也喜欢。
        If he can do it, so can I. 要是他能做此事,我也能。
:(1)若前面提出某一否定的情况,要表示后者也属于同样的否定情况,则应将其中的so改为neither或nor:
如:You aren't young and neither am I. 你不年轻,我也不年轻。
        She hasn't read it and nor have I. 她没有读它,我也没有读。
        (2)注意该结构与表示强调或同意的“so+主语+特殊动词”结构的区别:
如:"It was cold yesterday." "So it was."“昨天很冷。”“的确很冷。”
        "Father, you promised." "Well, so I did."“爸爸,你答应过的。”“嗯,是答应过。”
5、由not only…but also引出的倒装:
当not only…but also位于句首引出句子时,not only后的句子通常用部分倒装形式:
如:Not only is he a teacher, but he is also a poet. 他不仅是一位教师,而且是一位诗人。
        Not only did he speak more correctly, but he spoke more easily. 不仅他讲得更正确,也讲得更不费劲了。
6、虚拟条件句省略if后构成的倒装:
当if引导的虚拟条件从句中含有had, were, should等时,如将if省略,则要将had, were, should等移到主语前,构成倒装句:
如:Had you come yesterday, you would have seen him. 若你昨天来,你就会见到他了。
        Should you require anything give me a ring. 如果需要什么,可以给我打电话。
        Were it not for your help, I would still be homeless. 要不是你帮助,我会仍然无家可归。
注:省略if后提前的had不一定是助动词:
如:Had I money, I would buy it. 假若我有钱,我就会买它。