主語從句（11張）ppt課件

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：什么是主語從句？思索：什么是主語從句？ 1.定義：主語從

2、句是在復(fù)合句中充任主語的從定義：主語從句是在復(fù)合句中充任主語的從句。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.引導(dǎo)詞引導(dǎo)詞連詞連詞 that, whether that, whether不作成分不作成分銜接代詞銜接代詞 who(ever),whom(ever), who(ever),whom(ever), which(ever),wh

3、at(ever),whose which(ever),what(ever),whose 主、賓、表、定主、賓、表、定銜接副詞銜接副詞 where ,when ,why ,how where ,when ,why ,how 狀語狀語劃出從句，標(biāo)出引導(dǎo)詞在從句作何種成分劃出從句，標(biāo)出引導(dǎo)詞在從句作何種成分(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主主賓賓定定地點狀語地點狀語方式狀語方式狀語如何選用引導(dǎo)詞？如何選用引導(dǎo)詞？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 主語從句作主語時，謂語動詞普通用單數(shù)方式。主語從句作主語時，謂語動詞普通用單數(shù)方式。Conclusion: 但是，由但是，由what引導(dǎo)的主語從句后謂語動詞的數(shù)要

6、引導(dǎo)的主語從句后謂語動詞的數(shù)要根據(jù)句意而定根據(jù)句意而定 What I need is money. What I need are books. 2 連詞連詞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 引導(dǎo)的主語從句有時為了使句子構(gòu)引導(dǎo)的主語從句有時為了使句子構(gòu)造平衡造平衡, 防止防止 “頭重腳輕頭重腳輕, 常用常用 it 作方式主語作方式主語, 而把從句放在后面。而把從句放在后面。3. 3. 用用itit作方式主語的主語從句作方式主語的主語從句It is + adj + that. It is + n + that.It is + 過去分詞 + that. It + happened that .碰巧 It + seems that .似乎很明顯，那個女孩在說謊很遺憾他不能和我們一同去聽說他去過美國 It is obvious that the girl is telling lies. 本卷須知本卷須知 whether與與if均為均為“能否能否1.在用在用it作方式主語的主語從句中，作方式主語的主語從句中，if可以可以和和whether交換交換2.引導(dǎo)主語從句并放在句首、及引導(dǎo)表語從引導(dǎo)主語從句并放在句首、及引導(dǎo)表語從句、或者后面有句、或者后面有or not 或作介詞賓語時，或作介詞賓語時，只能用只能用whether，不能用，不能用if1. It is not decided yet they will sell th