教案3 Unit3 A healthy life
Grammar

Teaching material
NSEFC Book 6 —— Unit 3
Teaching aims
Enable the students to master the usage of it.
Teaching important & difficult points
How to enable the students to know the usage of it.
Teaching aids
tape recorder, slides
Teaching procedures
Step1 Revision
Complete the passage with the suitable words in their proper forms.
1.due to 6. stress
2.addicted 7.quit
3.alcohol 8.drugs
4.manage 9.pregnant
5.cigarettes 10. adolescents
Smoking __________, drinking _______ or taking other__________ produce many harmful effects and have no real benefits. So why do ___________do it? Some begin because 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 don’t realize is that they will get into the habit and __________ become ____________. It will then be difficult to _________ the habit. A 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 in
Slide show
Discovering “It”
1．It rains heavily . 指天气
2. It is 20 kilometers from Granddad’s house to James’. 指距离
3. It is November 11, 2005. 指日期
4. It is 9 o’clock 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:
Xi’an is a beautiful city, isn’t it?
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 isn’t.
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, isn’t it?
It is a bit windy.
2. 指时间:
It was nearly midnight when she came back.
3. 指环境:
It was very quiet in the café.
4. 指距离：
It is half an hour’s walk to the city centre from my home.
5. 指日期：
What's the date today? It's May 1, 2007.
6. 指季节：
It is summer now.
7. 指度量：
It is about 5 kilograms.
8. 指价值：
----What's 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，dangerous… 
It 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.
It's kind of you to help me with the problem.
（3）It替代作主语的动名词的常见句型
It's no good/use doing…
It's（well）worth doing…
It's（well）worth one's while doing/to do…
It's（well）worth while doing/ to do
It's 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 he’s round and tall like a tree.
It is strange that it hasn’t 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 do
It 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 reporte
生词表: