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1、 学 案 装 订 线 Book 6 Unit 3 A healthy life 语法导学案Period 4【学习目标】1. 通过自学语法精粹的内容了解 it 的用法。2. 通过设置的习题练习掌握 it的用法 It 的用法语法精粹概述在英语中，it的使用相当广泛，它既可用作代词，如人称代词（personal it）、指示代词（demonstrative it）及非人称代词（impersonal it）, 也可用作引导词（anticipatory it）和强调结构中的强调词（emphatic it）it作代词1、用作人称代词（personal it）代替前文提到过的事物，it作真实主语或宾语。Th
2、e frog is not a warm-blooded animal. It is a cold-blooded one.青蛙不是温血动物，它是冷血动物。My pen is missing. I cant find it anywhere. 我的笔丢了，我哪儿也找不到它了。I wont be back tonight. Please tell my wife about it .我今晚不回来了，请你向我妻子说一声。I was disappointed with the film. I had expected it to be much better. 我对这部电影很失望，我曾盼望它更好。2
3、、用作指示代词（demonstrative it）相当于this或that，it有时不特指某件东西，而代表前面已提到的或将会发生的某件事情。-Who is knocking at the door? 谁在敲门？-Its me. 是我。I had a talk with the student. It was very helpful to her. 我和那个学生谈了次话，对她非常有协助。It happened during my stay in the United States. 事情发生在我在美国的时候。-Whose exercise book is that? 谁的作业本？-Its hi
4、s . 是他的。3、用作非人称代词（impersonal it）代词it可用来指除人以外的一切生物和事物，无阴阳性之分。可指时间、距离、度量、价值、自然现象（天气、气体、阴暗等）。-Whats the time? “几点了？”-Its half past ten. “十点半”（指时间）It is late autumn now. 现在是深秋。（指时间）It is rather cold today, isnt it?今天很冷，是不是？（指天气）-How far is it from here to the station? 从这儿到车站有多远？-Its about two kilometers
5、. -大约两公里。（指距离）It is raining hard. 雨下得很大。（指自然现象）-Whats the cost of the dictionary? 那本词典多少钱？It is sixty-three. 六十三元（指价值）It did not snow much last winter. 去年冬天雪下得不多。（指自然现象）it作引导词1、作形式主语（formal subject）当主语是动词不定式短语、动词的-ing形式短语和主语从句时，为了避免头重脚轻，往往把主语放在谓语动词之后，习惯上用it作形式主语来指代后面的真实主语。这个it作形式主语，放在谓语动词后的主语是真正的主语。
6、(1) 代替不定式短语Is it necessary to complete the design before National Day? 国庆节前完成这个设计有必要么？In fact, it is a hard job for the police to keep order in an important football match.事实上，在重要的足球比赛时，警察维持秩序很困难。Its not easy to finish the work in two days. 两天之内完成这个工作不容易。It is necessary to use a short-wave radio.使用短
7、波收音机很有必要。It is not a good habit to stay up late.开夜车不是个好习惯。（2）代替动词-ing形式短语It is no use crying over spilt milk.覆水难收。It is dangerous walking on thin ice.在薄冰上行走是危险的。It wont be any help my going with you.我跟你去也没什么协助。Is it any good trying again?再试一次有用吗？（3）代替主语从句It is a fact that English is being accepted a
8、s an international language.事实上，英语是公认的国际语言。It is a pity that you didnt go to see the movie.你没去看这个电影， 真是可惜。Has it been decided when we are to hold the sports meet?我们啥时候开运动会决定了没有？It is known to all that Christopher Columbus discovered America in 1492.众所周知，克里斯托夫哥伦布于1492年发现了美洲。Does it matter if he cant
9、finish the job on time?如果他不能按时完成那工作要紧吗？2、作形式宾语(formal object)当复合宾语中的宾语是动词不定式、动词-ing形式短语、宾语从句时，往往把宾语放在它的补足语的后面，而把引导词it放在全句谓语动词和宾语补足语的中间。放在宾语补足语后面的宾语叫真正宾语，放在全句谓语动词和宾语补足语中间的it叫形式宾语。（1）it代替不定式短语I dont think it possible to master a foreign language without much memory work. 我认为不实行大量的记忆学好英语是不可能的。He feels
10、it his duty to help others.他感到协助别人是他的职责。She found it very difficult to answer the question.她发现很难回答这个问题。People in the west make it a rule to buy Christmas presents for their relatives and friends.西方国家的人们习惯为他们的亲戚朋友买圣诞礼物。The little boy found it very interesting to study English.那小男孩发现学英语很有趣。(2）it代替动词-i
11、ng形式短语I think it no use telling them.我认为告诉他们没用。Do you consider it necessary sending more people over?你觉得再派一些人去有必要吗？We think it a waste arguing with him.我们认为和他争吵是浪费时间。(3)it代替从句I hate it when people talk with their mouths full我讨厌人们说话时嘴里吃东西。They want to make it clear to the public that they do an impor
12、tant and necessary job.他们想向公众表明，他们所做的工作既重要又有必要。We think it necessary that we (should) attend the meeting.我们认为我们去参加那个会议很有必要。They found it strange that no one would take the money.他们感到奇怪，谁也不要这笔钱。it用在强调结构中当我们要强调句子的某一部分（通常总是主语，宾语或状语）时，常用强调结构。其形式为“it is (was)+被强调的部分+who(that)+句子的其它成分”。在这种结构中，it无实际意义It wa
13、s Xiaoming whom(that)I met in the street last night.It was in the street that I met Xiaoming last night.It ws last night that I met Xiaoming in the street.It was I who met Xiaoming in the street last night.2、含有“It is ”的句型（1）It is time (for sb.) to do sth.It is (high) time that sb. did sth.(虚拟语气)（2）I
14、t is + 形容词（+of / for sb.）+ to do sth.通常用of的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。（3）It is + 形容词 + that + sb. + (should) do sth.（虚拟语气）能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probable、im
15、possible等。有时可省去should而直接用动词原形。如:It is important that we should pay close attention to grain.It is natural that he（should）say so.（4）It is/was + 时间 + since 从已多久了。It is three years since I met him in Beijing.It was a long time since I (had) lived in that small mountain village with these farmers.（注意两句中的时态）It is five months since I arrived in New York.我到纽约已经五个月了。It is five months since I was in New York.我离开纽约已经五个月了。（注意:终止性动词表示从动作发生时算起；如果是状态动词或不断性动词，则从动作或状态结束时算起。）（8）It is + 时间 + before 这个句型和上面句型中时间都是时间段，如
