高考热点“it”用法知多少?

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  代词“it”在英语中运用频率极高,学生对它极为熟悉,但由于其灵活性及一词多义,学生在具体运用过程中,不能把握其所指代的真正含义。作为老师有必要帮助学生梳理知识,构建“it”知识网络,使学生对其用法了然于胸,让他们在解题时不再彷徨。下面本文紧扣考点,根据学生的认知发展规律,分步剖析“it”的用法,每解读“it”的一个用法及时辅以跟踪训练,最后提供一些综合性的实战演练,供同学们参考。
  对于it的用法,首先要从总体上把握,它既可以用作代词(如人称代词、非人称代词),也可以用作引导词(作形式主语或形式宾语),还可以用来构成强调句型。下面从这三个方面进行详解并提供相关的跟踪训练,适度拓展“it”的易混句型,增加学生对“it”不同用法的辨别能力,掌握“it”解题规律,提高解题能力。
  一、 it用作代词
  当it用作代词时,要明确其所指代的具体内容。
  1. 用作人称代词
  在句子中作主语或宾语;指前面已经提到过的事物;性别不明或性别被认为不重要的人或动物;未指明但谈话双方都明白的事情或情况。例如:
  ①This is our new car. I bought it yesterday. 这是我们的新车。我昨天买的。 (指代前面提到的物品our new car )
  ②Did you hit it? 你打中了吗?(指代事件)
  ③The baby cries when it is hungry. 婴儿饿时就哭。(指代婴儿,尤指性别不详或无所谓时)
  ④—Who is knocking at the door? 谁在敲门?
  —It’s me. 是我。(指一定情景中所确定的人或事物,此时相当于指示代词,代指this和that,有时也指人)
   2. 作非人称代词
  指天气、时间、距离、环境等。也可模糊地指一般情形或上文的部分或整个意思。译成汉语时,it通常不一定译出来。例如:
  (1) It’s very hot. 天真热。
  (2) It’s early yet. 还早呢。
  (3) It’s about 50 kilometers from here to Nanjing. 从这儿到南京约有五十公里。
  (4) It is very quiet in the library. 图书馆很安静。
  【跟踪训练】
  ①A knock on the door made him look up… But______was only the head teacher.
  ②Someone is ringing the doorbell. Go and see______.
  A. who is he______B. who he is______
  C. who is it D. who it is
  【参考答案】
  ①It;②D.
  二、 用作引导词
  1. 作形式主语
  当动词不定式、动名词或从句作主语时,通常把它们放在谓语之后,而用it作形式主语,使句子保持平衡。
  (1) It+be+形容词/名词+(for sb.)to do sth.句意为:对某人来说,做……怎么样。It+be+形容词/名词+of sb. to do sth.句意为:某人这么做真是太adj.了(It代替to do作形式主语)例如:
  ①It is difficult for me to make a decision. 对我来说,做决定难(it代替to make a decision)。
  类似的形容词有:easy, hard, impossible, possible, important等。
  ②It is foolish of you to lie to your teacher. =You are foolish to lie to your teacher.
  你跟老师撒谎真蠢。
  类似的形容词有:nice, good, wrong, clever, careful, polite等。
  注意:当形容词说明人的性格特征时用It is adj of sb. to do sth.=Sb. is adj to do sth.
  【跟踪训练】
  用of和for填空。
  ①It is necessary____________us to master a foreign language.
  ②It is kind____________Tom to offer to help me solve the problem.
  Diligence redeems stupidity.
  【参考答案】
  ①for;②of.
  (2) It is no good/no use/useless/dangerous+doing sth.句意为:做什么没有好处/没有用/危险的。(It代替doing作形式主语)例如:
  It’s no use crying over spilt milk. 覆水难收。
  It is no good giving him advice, because he will not receive it.
  给他提建议是没有用的,他是不会接受的。
  It is dangerous playing with fire. 玩火是危险的。
  (3) 代替主语从句
  常见的有:
  ①It seems/appears/happens/turns out/proves+that… 句意为:似乎/碰巧/证明是……。例如:
  It happened that I had seen the film. 碰巧我已看过了那部电影。
  ②It is certain/likely/possible/probable+that… 句意为:肯定/可能……。例如:
  It is certain that the constant rising of the oil price will affect the development of the world economy. 不断上涨油价肯定会影响国际经济的发展。
  ③It is said/reported/known/believed+that句意为:据说/据报道/众所周知/据信……。例如:
  It is known that every coin has two sides. 众所周知,任何事物都有两面性。
  注意1:当形容词是necessary, strange, important, natural, 名词是a pity时,从句需用虚拟语气. 动词形式:(should)+动词原形。例如:
  It is important that students (should) learn to depend on themselves in life.
  学生在生活上学会独立是很重要的。
  注意2:过去分词为表示“建议”、“命令”,“愿望”时,如suggested, ordered, requested等,从句需用虚拟语气。动词形式:(should)+动词原形。例如:
  It is requested that Liu Dehua (should) give another performance. 有人请求刘德华再表演一个节目。
  【跟踪训练】
  ①______is a fact that English is being accepted as an international language.
  A. ThereB. This C. That D. It
  ②Does____________matter if he can’t finish the task on time?
  A. this B. that C. it D. he
  ③Cheer up! It is no use____________about the future.
  A. worrying B. to worry
  C. worried D. worry
  【参考答案】
  ①D;②C;③A.
  2. 作形式宾语
  (1) 常与feel, consider, find, believe, make, take, imagine, think, suppose, regard等连用。例如:
  ①I feel it necessary to raise people’s awareness of protecting the earth.
  我觉得提高人们保护地球的认识很有必要。
  ②Kate thought it no use trying to persuade him. 凯特认为劝他没用。
  (2) like, dislike, hate, appreciate, depend/count on这些及物动词或短语不能直接加宾语从句,需加it之后再加宾语从句。例如:
  ①I hate it when people talk with their mouths full. 我讨厌人们嘴里吃着东西讲话。
   ②I dislike it when others shout at me. 我不喜欢别人对我大喊大叫。
   ③I really appreciate it if you help me. 如果您能帮忙,我将不胜感激。
  勤能补拙。
   ④You may count on it that they will support you. 你就相信吧,他们会支持你的。
  【跟踪训练】
   ①They have made____________a rule____________in the room.
  A. it; not to smoke
  B. this; not to smoke
  C. it; smoking
  D. it; to not smoke
  ②I don’t think____________possible to master a foreign language without much memory work.
   A. this____________ B. that______
  C. its______ D. it______
  ③I like____________in the autumn when the weather is clear and bright.
  A. this____________ B. that______ C. it____________D. one
  ④You may depend on____________ that they are of much help.
  A. that B. it
  C. these D. them
  【参考答案】
  ①A;②D;③C;④B.
  三、 用于强调句中
  1. 强调句型
  It is/was+被强调部分+that/who+句子其他成分。
  强调人时可用that/who来连接,强调事物时常用that。所强调的可以是单词、短语或从句,被强调的成分可以是主语、宾语和状语,但不能是定语或谓语。例如:
  ①It is I who/that am wise. 我才是明智的。(主语)
  ②It was in the classroom that I saw him. 我是在教室里看见他的。(状语)
  2. 强调句型的疑问式
  (1) 一般疑问句式
  Is/Was it+被强调部分+that/who+句子其他成分?例如:
  ①Is it Guo Jinming that/who young readers like most?
  年轻读者最喜欢的作家是郭敬明吗?
  ②Was it in 1939 that the Second World War broke out?
  第二次世界大战是在1939年爆发的吗?
  (2) 特殊疑问句式
  特殊疑问词+is/was it+that/who+句子其他成分?例如:
  ①How was it that you succeeded? 你是怎么成功的?
  ②Why is it that mobile phones are increasingly used?
  为什么越来越多地使用手机?
  ③Who is it that will be sent abroad for further study?
  将被派到国外进修的是谁?
  3. not… until…句型的强调句
  It is/was not until+被强调部分+that+其他成分。例如:
  (1) He didn’t go to bed until ten o’clock. 他直到九点钟才睡觉。
  强调句为:
  It was not until ten o’clock that he went to bed. 他直到九点钟才睡觉。
  (2) I didn’t realize she was my English teacher until she took off her dark glasses.
  直到她摘下墨镜我才意识到她是我英语老师。
  强调句为:
  It was not until she took off her dark glasses that I realized she was my English teacher.
  Beware beginning.
  【跟踪训练】
  ①—Were all the three people in the car injured in the accident?
  —No,____________only the two passengers who got hurt.
  A. it were B. there is
  C. it was D. there was
  ②—Who is making so much noise outside?
  —______ the children.
  A. It is B. They are
  C. That is D. There are
  ③It was____________she was about to go out® ______ the telephone rang.
  A. so; thatB. when; that
  C. before; thenD. when; before
  ④It was____________he said____________disappointed me.
  A. that; what B. that; when
  C. it; when D. what; that
  ⑤It was not until 1920____________regular radio broadcasts began.
  A. while B. which C. that D. since
   【参考答案】
  ①C;②A;③B;④D;⑤C.
  四、 “it”引起的易混淆句型
  1. it与连词before/when/since的句型
   (1) It be+时间段+before引导的状语从句,句意为:“过多久……才”。
  ______ It be not+时间段+before引导的状语从句,句意为:“不久……就”。
   例如:
  ①It was three years before he finished writing the book.
  他花了三年才完成这本书。
  It was not five minutes before the reporter arrived on the spot.
  没过五分钟记者就到了现场。
  (2) It be+时间点+when引导的状语从句,句意为:“做……时几点了”。例如:
  It was eight o’clock when he came to school yesterday.
  他昨天到校时八点了。
  注意:这里的“it”指时间,when引导的是状语从句。
  比较:It was at eight o’clock that he came to school yesterday. 他昨天是在八点钟到校的。(该句是强调句)
  【跟踪训练】
  ①It was nearly at 10:30____________we got to the lonely village.
  ②It was nearly 10:30____________we got to the lonely village.
  【参考答案】
  ① that;②when.
  (3)It is/has been+时间段+since引导的状语从句(瞬间动词的过去时),句意为:“自从做什么已有多久了”。It is/has been+时间段+since引导的状语从句(延续性动词的过去时),句意为:“自从不做什么已有多久了”。例如:
  ①It is/has been three weeks since he arrived here.
  他到这儿已经有三周了。
  类似的动词:meet, see, go, leave等。
  ②It is two years since he lived here. 自从他不住这儿已经有两年了。
  类似的动词:stay, smoke, work, be等。
  【跟踪训练】
  翻译下面句子。
  ①自从我上一次见到他已经有两年了。
  _______________________________________ .
  ②自从他戒烟已有三年了。
  _______________________________________ .
  以谨慎开始。
  【参考答案】
  ①It is/has been two years since I last met him.
  ②It is/has been three years since he smoked.
  2. It’s time for sth./to do sth./that(虚拟语气)结构 “是……时候了”。
  ①It’s time for the meeting. 该开会了。
  ②It’s time to go to bed. 该上床休息了。
  ③It’s time that we should go to bed/went to bed. 我们该上床休息了。
  注意:从句中,谓语动词要用虚拟语气,用“should+动词原形”(should不能省);或者用动词的过去式。
  3. It is/was+the first (second…)time+that-clause(has/had done),句意为:“某人第一(二……)次做某事”。
  ①It is the first time that she has visited our school.
  ②It was the second time that I had visited the Great Wall last year.
  主语除了it外,也可用this, that,其中序数词也可修饰day, month, year等名词.
  五、 实战演练
  为让学生真正掌握 “it”的用法,教师除了帮助学生梳理知识,及时做一些跟踪训练外,还需提供一些综合性强的名题或改编的题目或自编新题,让学生强化闯关,巩固学习成果,把握解题思路,直至真正掌握。学生在做题过程中可以小组合作探讨,老师适当进行释疑点拨。下面笔者将部分高考名题、改编的经典题目及原创题提供如下:
  1. (2011年北京卷)The employment rate has continued to rise in big cities thanks to the efforts of the local governments to increase____________.
  
  A. them B. those
  C. it D. that
  2. (2011年天津卷)We feel____________our duty to make our country a better place.
  A. it B. this_ C. that D. one
  3. (2011年江西卷)Why don’t you bring____________to his attention that you’re too ill to work on?
  A. that B. it C. his D. him
  4. (2009年四川卷)I like this house with a beautiful garden in front. but I don’t have enough money to buy____________.
  A. one B. it C. this D. that
  5. (2006年浙江卷)____________is our belief that improvements in health care will lead to a stronger,more prosperous economy.
  A. As B. That C. This D. It
  6. (2006年山东卷)I’d appreciate____________if you would like to teach me how to use the computer.
  A. that B. it C. this D. you
  7. (原创)Premier Wen Jiabao said it was those______®  were responsible for the train crash in Wenzhou____________would be severely punished.
  A. who; which B. who; that
  C. who; where D. which; who
  8. (原创)I advised Lucy strongly that she should take more exercise and eat more vegetables,but____________didn’t help.
  A. it B. she C. which D. he
  9. It was in the small house____________was built with stones by his father____________he spent his childhood.
  A. which; which B. that ; where
  C. which; that D. that; which
  10. Was it in 1969____________the American astronaut succeeded____________landing on the moon?
  A. when; on B. that; on
  C. when; in D. that; in
  11. It was not until she arrived at the cinema ®______ she realized she had forgotten her ticket.
  A. what B. when C. this D. that
  12. (原创)It is time that the government____________action to narrow income gap.
  A. took B. will take
  C. take D. takes
  13. (原创)I think it no good____________ this failure. We should learn to face it and try again.
  A. ignore B. ignoring
  C. ignored D. to ignore
  14. —It’s a long time____________ I saw you last.
  —Yes, and what a pity it is now that it will be a long time____________we see each other again.
  A. before; since B. since; when
  C. since; before D. when; before
   15. (原创)It’s suggested that more jobs____________ in small towns so that young couples needn’t leave their babies at home to earn money.
  A. be created B. created
  C. creating D. will be created
  
  参考答案
  1-5 DBBAC 6-10 DCABB 11-15 ACBAD
  
  (作者,陈兰,盐城市第一中学)
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