1、新课程标准高中英语选修六UNIT3 A Healthy Life第三课时(语法课)学案Discovering useful structures一、学习目标通过在第一课时的精读文章中找含有it的句子，让学生认识it的用法。二、知识重难点掌握it的两个用法：形式主语和形式宾语，和表示时间、天气、距离等。三、知识点拨1指代时间、天气、距离、自然现象等。It is half past two now. (指时间)It is 6 miles to the nearest hospital. (指距离)It is very cold in the room. (指温度)It is a lovely da
2、y, isnt it? (指天气)2. 用作形式主语和形式宾语，而把真正的主语或宾语放在后面，真正的主语或宾语往往由从句、动名词、不定式充当。（一）形式主语it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。It is certain that she will do well in the exam.( 真正的主语是从句)It is no good/use copying others homework. ( 真正的主语是动名词)It is hard to learn a foreign language well. ( 真正的主语是不定式) It +
3、 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，dangerousIt is illegal（
4、for a teenager）to drive a car without a license. 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. It替代作主语的动名词的常见句型Its no good/use do
5、ingIts（well）worth doingIts（well）worth ones while doing/to doIts（well）worth while doing/ to do Its no use crying over spilt milk. it作形式主语替代主语从句 It + be + adj. +clause It is strange (surprising / obvious/ true/ good/ possible /certain / clear, etc.that It is very clear that hes round and tall like a t
6、ree. It + be + v-ed that It is said(decided/ expected/ known/ accepted/ acknowledged/reported/ thought/ known /told/ hoped/ believed / learnt, etc) that It is said that he has come to Beijing.It is reported that another earth satellite has been put into orbit. It + be + vi + thatIt seems (happens /t
7、urns out/ occurs to sb. etc.)thatIt seemed that things were not as they expected.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
8、in your class. 这种事竟然发生在你们班上，真是遗憾！It is a pity that he is ill. 他生病了，真遗憾！ （二）形式宾语You can depend on it that we will help you. ( 真正的宾语是从句)We consider it no good reading when lying in bed. ( 真正的宾语是动名词)He finds it not easy to quit smoking, once he is addicted to it. ( 真正的宾语是不定式)注：通常需要接形式宾语it词有：make/ find/
9、 think / feel/ believe / consider/ take / enjoy/ love / like / appreciate/ see to / rely on/ insist on / depend on, etc.3. 指代前面所提到过的事情、事物、身份性别不明或被认为不重要的人或物等。There is only one book left in that bookstore, go and buy it.(指前面提到的那本书)-I have broken a plate.- It (= Breaking the plate) doesnt matter. (指前面提
10、到的事情)-Who is breaking the door? - It must be the milkman. (指身份不明的人)4. it 还可用来构成强调句。（见第四单元语法部分）It is he that/ who has realized the seriousness of the situation.四、知识拓展有关it的固定句型。I hate/ love/ like it when she sings for me.喜欢/讨厌I will appreciate it if you can help me. 如果(我)将感激不尽。When it comes to footbal
11、l, he is more excited. 当提到Please see to it that you bring enough money. 务必I dont mind it if you are late. 介意You can count on /depend on/rely on it that we will help you. 相信It is the first time that sb. has done It is (high) time that sb did/ should do 第三课时语法课 练案A完成句子1. 我认为我们开这个会是没有必要的。I think _ _ th
12、at we have the meeting.2. 劝他没有用。_ _ _ trying to persuade him.3. _ _ _ _ （众所周知），China has the largest population in the world.4. _ _ _ (据说) all of them have gone to the cinema.5. I _ _ _(讨厌) people talk with their mouths full.6. You must _ _ _ _ (相信) they are of much value.改写句子7. Giving up smoking is
13、 difficult. (It is )8. Some young people think they look attractive when they smoke. (It seems)9. Most people believe smoking causes cancer. (It is believed)10. Dont try to quit on a stressful day. (It is no use)11. China produces one third of the worlds cigarettes. (It is astonishing)11. The night
14、was dark and stormy when the old man started his journey. (It was a )练案B单项选择（ ）1.（2010高考辽宁卷，33）The fact that she was foreign made _difficult for her to get a job in that country A. so B. much C. that D. it （ ）2.（09四川6）I like this house with a beautiful garden in front, but I dont have enough money t
15、o buy_.A. one B. it C. this D. that（ ）3. （2006年浙江卷，4） _ is our belief that improvements in health care will lead to a stronger, more prosperous economy. A. As B. That C. This D. It（ ）4. (2007年全国卷I，7） _ felt funny watching myself on TV. A. One B. This C. It D. That（ ）5.（2006年I，26） If I can help_, I d
16、ont like working late into the night.A. so B. that C. it D. them（ ）6. (09高考）They are good friends. _ is no wonder that they know each other so well.A. This B. that C. It D. There（ ）7.（2010高考全国II卷，14）The doctor thought _ would be good for you to have a holiday.A. this B. that C. one D. it （ ）8.（2007年
17、山东卷，24）_ worries me the way he keeps changing his mind. A.This BThat CWhat DIt 分析it成分，辨清相似句型。9. _ is well known to us all that the earth is round._ is well known to us all, the earth is round. A.That B.As C.It D.Which10. _doesnt matter much whether hell come to the party. I feel _ an honour to be in
18、vited to speak here. A. this B. it C. that D. what 11. _ no wonder that he has passed the exam. _ no need for you to wait here. A.There being B.It was C.It is D.There is12. Its very kind _ you to help us. Its very important _ you to keep the balance of nature. A.for B.of C.to Dwith .13. It is no goo
19、d _ such a thing.Its of no importance _ such a thing. A.do B.to do C.doing D.done14. Its time that we _ to school. It is the second time that we _ to Beijing. A.go B.went C.have been D.have gone15. Its tomorrow _ he is going to Beijing. It was 8 oclock _ he went to school. A.that B.when C.before D.since16. It is 3 years _ he joined the army. It will be 3 years _ we meet again. A.before B.after C.since D.when