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1、單擊此處編輯母版標題樣式,單擊此處編輯母版文本樣式,第二級,第三級,第四級,第五級,*,Noun clauses as,the subject,主語從句,Revision,Find the subjects in the following sentences.,1.A tree has been cut down.,2.You are a student.,3.To study English well can be difficult.,4.Smoking is harmful to our health.,5.What she said is not yet known.,思考：什么是主

2、語從句？,1.,定義：,主語從句,是,在復合句中充當,主語的從句,。,1.,Whose,watch was lost is unknown.,2.,Whatever,you did is right.,3.,who,will host the meeting hasnt been decided.,4.,What,you said just now is not true.,找一找,主語從句,主語從句,2.,引導詞,連詞,that,whether,（不作成分）,連接代詞,who(ever),whom(ever,),which(ever),what(ever),whose,（主、賓、表、定）,連

3、接副詞,where,when,why,how,（狀語）,劃出從句，標出引導詞在從句作何種成分,(,不作成分）？,That,China will become stronger is certain.,Whether,life exists on other planets is not clear,who,will host the meeting hasnt been decided.,What,you said just now is not true.,Whose,car runs faster is obvious.,Where,she is from is unknown,How,t

4、he accident happened is not clear,主,賓,定,地點狀語,方式狀語,如何選用引導詞？,Complete the sentences using,what,whether,where,when,，,who,why,how,or,that,.,1._,is needed for success,is,your hard work.,2._,we need more practice,is,quite obvious.,3._,can join in the sport meet,is,decided by the teacher.,4._,it will rain

5、or not,is,not clear.,What,That,Who,Whether,5.,_,the earth is becoming warm,is,a good topic for research.,Why,1,主語從句作主語時，謂語動詞一般用,單數(shù),形式。,Conclusion:,但是，由,what,引導的主語從句后謂語動詞的數(shù)要根據(jù),句意,而定,What,I need,is,money.,What,I need,are,books.,2,連詞,That,位于句首不能省略,1.That he will refuse this piece of advice is impossibl

6、e.,2.That they should like each other,is natural.,_,It,is impossible,that,he will refuse this piece of advice.,It,is natural,that,they should like each other.,注意,:,由,that,引導的主語從句有時為了使句子結構平衡,避免“頭重腳輕”,常用,it,作,形式主語,而把從句放在后面。,3.,用,it,作形式主語的主語從句,It,is,+,adj,+that.,It,is,+,n,+,that.,It,is,+,過去分詞,+that.,It

7、+happened that,.,碰巧,It+seems that.,似乎,很明顯，那個女孩在說謊,很遺憾你不能和我們一起去,據(jù)說他去過美國,It is obvious that the girl is telling lies.,注意事項,whether,與,if,均為“,是否,”,1.,在用,it,作形式主語的主語從句中，,if,可以和,whether,替換,2.,引導,主語從句并放在句首,、及引導,表語從句、或者后面有,or not,或作介詞賓語,時，,只能用,whether,，不能用,if,1.It is not decided yet,they will sell the house.,2.,he will come is not clear,3.The question is,hell come,Im not sure about,well win.,whether(if),whether,whether,whether,Thats all.,See you!,