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1、Unit3 A healthy lifeGrammar and Useful StructuresTeaching materialNSEFC Book 6 Unit 3Teaching aimsEnable the students to master the usage of it. Teaching important & difficult pointsHow to enable the students to know the usage of it.Teaching aidstape recorder, slidesTeaching proceduresStep1 Revision
2、Complete the passage with the suitable words in their proper forms.1. due to 6. stress 2. addicted 7.quit 3. alcohol 8.drugs4. manage 9.pregnant5. cigarettes 10. adolescentsSmoking _, drinking _ or taking other_ produce many harmful effects and have no real benefits. So why do _do it? Some begin bec
3、ause they believe it makes them look cool. Others think it will help with _. In their life possibly_ pressure from their parents or teachers.Some just want to see what it is like. What they dont realize is that they will get into the habit and _ become _. It will then be difficult to _ the habit. A
4、few people _to quit easily but for many it is a very painful process. Of course, the best way to deal with these drugs is not to start in the first place.Keys：cigarettes；alcohol；drugs；adolescents；stress； due to；eventually；addicted ; quit；manage Step2 Lead inSlide show Discovering “It”1It rains heavi
5、ly . 指天气2. It is 20 kilometers from Granddads house to James. 指距离3. It is November 11, 2005. 指日期4. It is 9 oclock at night. 指时间5. It is bad to smoke. 形式主语6. It is no good smoking. 形式主语7. It is likely that he will succeed. 形式主语Step3 The use of “it”一、“it”作人称代词1. it的最基本用法是作代词，主要指刚提到的事物，以避免重复:Xian isabe
6、autifulcity, isntit?They watched the train until it disappeared in the distance.2. 也可以指动物或婴儿(未知性别的婴儿或孩子):Is this your dog？No, it isnt.二、it作非人称代词 it有时并不指具体的东西，而泛指天气、时间、日期、距离、价值、度量、温度、环境等，称为非人称的it：1. 指天气：It is a lovely day, isntit?It is a bit windy.2. 指时间: It was nearly midnight when she came back.3.
7、指环境: It was very quiet inthecaf. 4. 指距离：It is half an hourswalkto the city centre from my home.5. 指日期：Whats the date today? Its May 1, 2007.6. 指季节：It is summer now.7. 指度量：It is about 5 kilograms.8. 指价值：-Whats the cost of the T-shirt?-It is 150 Yuan.三、it用作形式主语替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于
8、句尾。1. 代作主语的动词不定式，其句型为（1）It be adj.（for sb.）to do sth.此处adj. 通常为描述事件的形容词：easy，difficult，hard，necessary，unnecessary，possible，impossible，likely，unlikely，right，wrong，important，unimportant，legal，illegal，well-mannered，ill-mannered，polite，impolite，clear，obvious，certain，suitable，proper，fit，useful，useless，da
9、ngerousIt is illegal（for a teenager）to drive a car without a license.（2）It be adj. of sb. to do sth.此处adj. 通常为描述人的形容词：kind，unkind，nice，rude，cruel，considerate，thoughtful，thoughtless，careful，careless，silly，foolish，stupid，clever，wise，crazy. Its kind of you to help me with the problem.（3）It替代作主语的动名词的常见句
10、型Its no good/use doingIts（well）worth doingIts（well）worth ones while doing/to doIts（well）worth while doing/ to doIts no use crying over spilt milk.2作形式主语替代主语从句1. It is clear ( obvious，true，possible，certain.) that.该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为“清楚（显然，真的，肯定）”是主语从句最常见的一种结构。例如：It is very clear that
11、hes round and tall like a tree. It is strange that it hasnt been noticed before.真奇怪，它以前没有引起注意。2 It is v-ed that=sb/sth is to doIt is said (reported/ learned/believed/thought/known/told/hoped.) that. 该句型中的it 仍是形式主语，真正主语是that 引导的主语从句；该结构常译为“据说（据报道，据悉）”。It is said that he has come to Beijing.It is repo
12、rted that another earth satellite has been put into orbit. It is + noun +从句 It is a pity (a shame /an honor /a good thing/a fact /a surprise/.) that. 该句型中，that后的从句一般用虚拟语气（should + 动词原形），should可省去表示出乎意料，常译为“竟然”。没有这种意义时，则不用虚拟语气。例如：It is a pity that such a thing (should) happen in your class. 这种事竟然发生在你
13、们班上，真是遗憾！It is a pity that he is ill. 他生病了，真遗憾！ 四、it作形式宾语当复合宾语中的宾语是不定式、动名词宾语从句时，往往把宾语放在它的补足语后面，而用it 作形式宾语，放在宾语补足语之前。该句型中的it 作形式宾语，常用的动词有think, believe, make, find, consider, feel等。 I think it no use arguing with him.我认为和他争吵没有用。I found it very interesting to study English.我发现学英语非常有趣。He made it clear
14、that he was not interested in this subject.他非常清楚地表示他对那门学科不感兴趣。五、用于强调句型It is/was + 被强调部分 + that/who . It is not until + 被强调部分 + that . I met Tom in the park yesterday1) It was I who met Tom in the park yesterday.2) It was Tom who I met in the park yesterday.3) It was in the park that I met Tom yesterday.4) It was yesterday that I met Tom in the park.It was five oclock _when_I got home.It was at five oclock_that_ I got home.It was she who that had been wrong是她错了。（主语） It was the girl whom that I met just now我刚才遇见的就是这个女孩。（宾语） It was Tom to whom the teacher had talked老师与其谈话的那个人
