高中英語選擇性必修二 Unit 1 Period 3 Discovering useful structures（課件）(共20張)

1、人教版 選擇性必修二Period 3 Discovering useful structuresThe Predicative ClausesUnit 1 Science and Scientists1. Enable the Ss to master the usage of predicative in this unit.2. Enable the Ss to use the predicative patterns flexibly.3. Train the Ss to apply some skills by doing the relevant exercises.Teaching

2、 GoalsGrammar focus:Predicative clausesThe question is who will do it.定義：表語從句放在 之后，充當(dāng)復(fù)合句中的 。結(jié)構(gòu): It seems that it is going to rain.It looks as if he is unhappy today. 自我探究 主語+系動詞 +引導(dǎo)詞 +簡單句系動詞 表語 Underline all the examples in the reading passage where noun clauses are used as the predicative. Then sta

3、te their meaning and functions.1.One theory was that _2. Another was_3. The truth was_that cholera was caused by an infection from germs in food or water.bad air caused the disease.that the water from the Broad Street pump had been infected by waste.S+V+Plink verbPredicative 表語Predicative is used _

4、the link verb.A sentence which is used as predicative is Predicative Clause表語從句.be動詞;感官動詞：sound, taste, smell, look, feel;表示變化的詞：go, get, turn, become.behindIt look as ifIt turned out that總結(jié)Grammar focus:表語從句之引導(dǎo)詞1.引導(dǎo)詞的用法 (that) that在表語從句中 ,又 且_ 省略。1.The fact is that he hasnt yet recovered from illne

5、ss. 2.The reason why he has to go is that his mother is ill in bed. 既不充當(dāng)成分沒有意義不可whether在表語從句中表 , 但_句子的成分。 1.What the doctor really doubts is whether my mother will recover from the serious disease soon. 2.The question is whether it is worth doing.“是否”2.引導(dǎo)詞的用法 (whether )不充當(dāng)She asked me if /whether sh

6、e could borrow these books . The question is if/whether we can rely on him.在表語從句中, 表“是否” 時(shí), 只能用“whether”不能用“if”。I dont know _ he wants to go alone.The problem was _ _he could come on time.if or whether?if/ whether whetherwhat 在表語從句中充當(dāng)_ 表示_.1. The question is what caused the accident. 2. That mountai

7、n is no longer what it used to be .3. What he told you was what had been discussed at the meeting.主語、表語、賓語什么，什么樣子，或所的（人或事）3.引導(dǎo)詞的用法 (what)主語表語賓語 who 在表語從句中充當(dāng)_表示_.The problem is who could do the work2. My trouble is who (whom) I can turn to.主語、賓語或表語誰4. 引導(dǎo)詞的用法 (who)主語賓語 which 在引導(dǎo)表語從句時(shí),常充當(dāng)_ 表示 。 I read

8、about it in some book or another,but what I dont know is which (book) it is. 定語,表語其/當(dāng)中哪一個5.引導(dǎo)詞的用法 (which)定語由as if ,as though引導(dǎo)表語從句，表示 。句子中的系動詞常用look, appear, seem等。1.It looks as if it was going to rain.2.The young man with long hair looks as if he were a girl. 6.引導(dǎo)詞的用法（as if, as though）好像 當(dāng)主句的主語為rea

9、son,或者是由why引導(dǎo)的從句時(shí),與它們相關(guān)的表語從句用_,而不能由_ 引導(dǎo); because 引導(dǎo)表語從句時(shí)只能用于_句型中. 1.The reason why I was late was that I missed the train.2. I was late. It/That/This was because I missed the train.thatbecauseIt/That/This is /was because7 引導(dǎo)詞的用法（the reason why is that/ It is because）當(dāng)表語從句中主語、賓語、表語具備，但是還是要表示疑問含義，可以判斷

10、句子中缺少狀語，常常用相應(yīng)的特殊疑問詞引導(dǎo)，有 why 表 , when表 , where表 , how表 等。This is how he did it.That is why the brothers wanted to make a bet.Thats why weve given you the letter.8. 引導(dǎo)詞的用法(why/when/where/how) 為什么 在時(shí)候 在哪里 怎么樣 Answer the following questions using the information from the reading passage as well as the p

11、redicative clauses.EXAMPLEWhat Was it that John Snow showed to the world?What John Snow showed to the world was how cholera could be overcome.1. What was Snows discovery in two particular streets in London?Snows discovery in two particular streets in London was that_2. What was Snow determined to fi

12、nd out during the 1854 outbreak of cholera in London?What Snow was determined to find out was why _3. What were the exact places(Snow marked on the map? )The exact places Snow marked on the map were where_4. What was the finding that Snow announced?Snows finding was that_more than 500 people died in

13、 ten days.the cholera outbreak was so severe in the two particular streetsall those who died had livedthe pump water carried cholera germs. David is talking to Maria about their scientific research project. First complete Davids lines (A-E, using the words in the box. Then put Davids lines in the co

14、rrect order and practice the conversation.A: Absolutely ! You may not believe it, but that was _happened at the initial stage of our groups research on developing a vaccine for malaria.B:Yes, it is. And it seemed_all the theories were useful, but the fact was_we couldnt persuade one another that one theory was better than another.C:Exactly The problem was not about_all our theories were equally good, but in deciding._theory to depend upon.D:We realised that what we cared about was not_aspect we needed to develop a theory in, but rather _we can reduce the cost of a vaccine with