主语从句（11张）ppt课件

1、Noun clauses as Noun clauses as the subjectthe subjectRevision 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.思索：什么是主语从句？思索：什么是主语从句？ 1.定义：主语从

2、句是在复合句中充任主语的从定义：主语从句是在复合句中充任主语的从句。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.2.引导词引导词连词连词 that, whether that, whether不作成分不作成分衔接代词衔接代词 who(ever),whom(ever), who(ever),whom(ever), which(ever),wh

3、at(ever),whose which(ever),what(ever),whose 主、宾、表、定主、宾、表、定衔接副词衔接副词 where ,when ,why ,how where ,when ,why ,how 状语状语划出从句，标出引导词在从句作何种成分划出从句，标出引导词在从句作何种成分(不不作成分？作成分？That China will become stronger is certain. Whether life exists on other planets is not clearwho will host the meeting hasnt been decided.

4、 What you said just now is not true.Whose car runs faster is obvious. Where she is from is unknownHow the accident happened is not clear主主宾宾定定地点状语地点状语方式状语方式状语如何选用引导词？如何选用引导词？Complete the sentences using what, whether, where, when， who, why, how or that.1._ is needed for success is your hard work.2.

5、_ we need more practice is quite obvious.3._ can join in the sport meet is decided by the teacher.4._ it will rain or not is not clear.WhatThatWhoWhether5. _ the earth is becoming warm is a good topic for research.Why1 主语从句作主语时，谓语动词普通用单数方式。主语从句作主语时，谓语动词普通用单数方式。Conclusion: 但是，由但是，由what引导的主语从句后谓语动词的数要

6、引导的主语从句后谓语动词的数要根据句意而定根据句意而定 What I need is money. What I need are books. 2 连词连词That位于句首不能省略位于句首不能省略 1. That he will refuse this piece of advice is impossible. 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

7、 each other.留意留意: 由由that 引导的主语从句有时为了使句子构引导的主语从句有时为了使句子构造平衡造平衡, 防止防止 “头重脚轻头重脚轻, 常用常用 it 作方式主语作方式主语, 而把从句放在后面。而把从句放在后面。3. 3. 用用itit作方式主语的主语从句作方式主语的主语从句It is + adj + that. It is + n + that.It is + 过去分词 + that. It + happened that .碰巧 It + seems that .似乎很明显，那个女孩在说谎很遗憾他不能和我们一同去听说他去过美国 It is obvious that the girl is telling lies. 本卷须知本卷须知 whether与与if均为均为“能否能否1.在用在用it作方式主语的主语从句中，作方式主语的主语从句中，if可以可以和和whether交换交换2.引导主语从句并放在句首、及引导表语从引导主语从句并放在句首、及引导表语从句、或者后面有句、或者后面有or not 或作介词宾语时，或作介词宾语时，只能用只能用whether，不能用，不能用if1. It is not decided yet they will sell th