高中英语（人教大纲）第二册下Unit20 Archaeology(第五课时).doc

The Fifth PeriodThe Use of “It” Teaching Aims:Revise and sum up the use of “it”.Teaching Important Point:Master the use of “it”,especially the emphatic use and the use as a preparatory subject or a preparatory object.Teaching Difficult Point:How to master the use of “it”correctly.Teaching Methods:1.Having a little quiz to revise the common use of “it”.2.Inductive method to go through some important sentence patterns with “it”.3.Practice to consolidate the use of “it”.Teaching Aids:1.a projector and some slides2.the blackboardTeaching Procedures:CStep GreetingsGreet the whole class as usual.CStep TestT:In the last two periods,we revised the use of “it”.Now lets have a test.(Teacher shows the following on the screen.)Tell what the word “it” refers to and its functions:1.Its difficult to remember all their names.2.Its very quiet in the cafe.3.It rained for three days.4.He made it clear that he didnt want to speak to me.5.It was nice seeing you.6.It was on Tuesday that Mrs Smith came.7.Its three miles to the nearest garage.8.A tall man stood up and shook hands.It was Captain Lawie.9.I hear you bought a new bike.Can you show it to me?10.It was five oclock when we got back home yesterday.T:Now Ill give you three minutes to write down your answers on a piece of paper.Then lets check the answers together.(Ss can exchange their papers for comment and correction.)Suggested answers:1.a preparatory subject for an infinitive2.refer to the present situation3.refer to weather4.a preparatory object5.a preparatory subject for an “-ing” form6.emphasize the adverbial of time7.refer to distance8.refer to a person when we are identifying somebody(saying who somebody is)9.refer to the word “bike” mentioned earlier10.refer to timeCStep Revision and InductionT:Well done.You are already familiar with the common use of “it”.Next,lets revise some important sentence patterns.Now,lets do an exercise.Look at the screen.Complete the sentences,paying attention to the structures of them and the use of “it”.1._(据报道)that dozens of children died in the accident.2._(真遗憾)that he cant swim at his age.3._(很可能)that they will beat us tonight.4._（看来）that he enjoys pop songs very much.5._（仍然是一个问题）when we shall have our sports meet.6._(还不确定)whether he can attend this conference or not.7._（不要紧/没关系）whether we go together or separately.8.Its up to you _（决定是否接受这项工作）。9.It is important _（我们学英语）.10.It is kind _（你们帮助我）.11.It took me five days _（解决这个问题）.12.Its no use _（与她争论）.T:Now please work in pairs to do it and you can write down the answers on a piece of paper.Then Ill check your answers.(If necessary,teacher may give some explanations.)Suggested answers:1.It was reportedIt be+p.p.(known,thought,told,believed,hoped)+that-clause2.It is a pityIt be+n.(an honour,a good thing,a fact,a surprise)+that-clause3.It is likelyIt be+adj.(wonderful,true,important,surprising,clear)+that-clause4.It seemsIt seems/appears/happens+that-clause5.It is still a questionIt be+n.+wh-/how-clause6.It is uncertainIt be+adj.(not decided,uncertain)+wh-/how-clause7.It doesnt matterIt doesnt matter(Its no wonder;It doesnt make too much difference)+wh-/how-clause8.to decide whether to take the job or notIts up to sb.to do sth.9.for us to learn EnglishIt be+adj.(difficult,easy,hard,important)for sb.to do sth.10.of you to help meIt be+adj.(kind,nice,brave,clever,stupid)of sb.to do sth.11.to solve the problem.It takes(took)sb.to do sth.12.arguing with herIts no use(no good,useless)doing sth.(Teacher writes the structures on the Bb one by one while checking the answers.)T:Look at the blackboard now.In all these structures,“it”is used as preparatory subjects.Can you tell me the real subjects in them?Ss:Yes.Infinitives,-ing forms and clauses.T:Quite right.You should remember and often use these structures.Besides,“it” can be used in some other structures to express “time”.Lets do another exercise on the screen.Complete the sentences1._(已经有三年了)since his father passed away.2._(不久)the police arrived.3._(已经八点了)when we got home.4._（该的时候了）she wrote a letter to her boyfriend.5._(这是第一次)that these Europeans have visited the Great Wall.6._（我们该）to go to school.(Ss prepare first.Then teacher checks the answers and sums up the structures with the whole class.At the same time,teacher writes the structures on the blackboard.)Suggested answers:1.It is/has been three yearsIt be+some time+since2.It was not long beforeIt be(not)+long(days,weeks,months)before3.It was already eight oclockIt be+definite time+when4.It is(high)time(that)It be(high)time+(that)5.It is the first timeIt be+the first(second,third)time+that-clause6.It is time for usIt be time for sb.to do sth.T:Well,we also know that “it”can be used as an preparatory object.Lets do an exercise.Look at the screen.Rewrite the following sentences,using“it”as a preparatory object.1.To make others laugh is difficult.(I found)2.To help him is my duty.(I consider)3.That we should keep calm is important.(I think)4.That he objected to the proposal is clear.(I made)T:Now I want some of you to rewrite the sentences one by one.Li Hao,the first one.S1:I found it difficult to make others laugh.T:The second one,Wang Hua.S2:I consider it my duty to help him.T:S3:I think it important that we should keep calm.S4:I made it clear that he objected to the proposal.T:Well done.From these sentences,we know that the commonest structure with “it” as a preparatory object is “subject+vt.+it+adj./n.+to do sth./that-clause.Some verbs like “find,feel,think，consider,make”are often used in this structure.Are you clear about it?Ss:Yes.(Bb:subject+vt.+it+adj./n.+to do sth./that-clause)T:Well,besides the use as a preparatory subject or object,we all know “it” can be used to give special emphasis to almost any part of a sentence except the verb.Can you tell me the emphatic structure?Ss:Yes.It is “It be+the emphasized part+who/that”.(Teacher writes the structure on the blackboard.)T:Quite right.Now lets look at the screen and do another exercise.(Teacher shows the following on the screen.)Correct mistakes if there are any.1.It is he that I want to see.2.It is I who is leaving for London next week.3.It was on Tuesday when Mrs Smith came.T:Whod like to do the first one?Any volunteer?S1:Let me try,“him” should be used instead of “he”,because the emphasized part is an object.T:Quite right.The second one?S2:“is” after “who” should be replaced by “am” to agree with “I” in person and number.T:S3:“when” should be replaced by “that” to give special emphasis to the adverbial of time.T:You are all right.Youve mastered this sentence structure very well.Now I will show you some other sentences.(Teacher shows them on the screen.)1.It is my turn.2.Lets call it a day.3.If the teacher sees you doing that,you will catch it.4.Go ahead,well make it in the end.5.I will study hard in the future.Thats it.6.Take it easy.T:Now please look at the sentences on the screen.Id like you to translate them into Chinese.Any volunteer?S1:轮到我了。S2:今天就到这里吧。S3：如果老师看到你这么做，你就会挨批评。S4：继续干吧，我们最终会成功的。S5:今后我会努力学习的。这就对了。S6：别着急。T：Very good.We can see in these sentences,“it” has no special meaning.Is that clear?Ss:Yes.T:Well,now lets do more exercises to further master the use of “it”.CStep Practice(Teacher shows the following on the screen.)Choose the best answers:1.Is_necessary to complete the design before National Day?A.this B.that C.it D.he2.She heard a terrible noise,_brought her heart into her mouth.A.it B.which C.this D.that3.Toms mother kept telling him that he should work harder,but _didnt help.A.he B.which C.she D.it4._is a fact that English is being accepted as an international language.A.There B.This C.That D.It5.I hope there are enough glasses for each guest to have_?A.it B.those C.one D.them6.Why dont you take a little break?Didnt we just have _.A.that B.this C.one D.it7.I dont think _ possible to master a foreign language without much memory work.A.this B.that C.its D.it8.He was nearly drowned once.When was _?_was in 1998 when he was in middle school.A.that;It B.this;This C.this;It D.that;This9.The weather turned out to be very good,_was more than we had expected.A.what B.which C.that D.it10.Was _ that I saw last night at the concert?A.it you B.not you C.you D.that yourself (Teacher gives the Ss some minutes to prepare,then checks the answers with the whole class.)Suggested answers:15 CBDDC 610 CDABACStep Summary and HomeworkT:In this class,we revised the use of “it”