初中主語從句講解.doc

此文檔收集于網(wǎng)絡(luò)，僅供學(xué)習(xí)與交流，如有侵權(quán)請聯(lián)系網(wǎng)站刪除主語從句名詞性從句包括：主語從句、表語從句、賓語從句和同位語從句。引導(dǎo)名詞性從句的連詞有：A.連詞：that, whether, if（這三個詞都不作從句的成分，同時(shí)，that無含義，而whether和if都表“是否”）B.疑問代詞：who, whom, whose, what, whichC.疑問副詞：when, where, why, how（一）主語從句：在復(fù)合句中充當(dāng)主語的從句。1.that引導(dǎo)主語從句that引導(dǎo)主語從句時(shí)不同于其他的連詞，既無詞義也不作成分，只起單純的連接作用，且通常不可以省。為了強(qiáng)調(diào)that引導(dǎo)的主語從句而置之于句首時(shí)，that不可省。That the driver could not control his car was obvious. 很明顯司機(jī)不能控制住他的車了That she was chosen made us very happy. 她被選上讓我們很高興That he will come is certain. 他要來已經(jīng)千真萬確了通常，that引導(dǎo)主語從句時(shí)用it做形式主語，把從句置于句尾，此時(shí)that有時(shí)可省。例如：It was obvious that the driver could not control his car. 很明顯司機(jī)不能控制住他It made us very happy that she was chosen. 她被選上讓我們很高興 It is certain that he will come. 他要來已經(jīng)千真萬確了如果以that從句為主語的句子是疑問句，就只能用先行詞it結(jié)構(gòu)。例如：Is it certain that he will come?Is it true that he would take the risk?it做形式主語有以下幾種不同的結(jié)構(gòu)：(1)It + be + 形容詞+ that-從句It is likely that he will come. 他可能會來It is strange that she has ever trusted him. 她相信他，真令人奇怪(2)It + be +名詞+ that-從句It is common knowledge that the whale is not a fish. 鯨魚并不是魚，這是常識Its a pity that he should havecatched the train. (3) It + be + -ed分詞 + that從句It is said that he is a famous writer. 據(jù)說他是個著名作家It is reported that there will be a storm this afternoon. 據(jù)報(bào)道下午將有一場暴風(fēng)在表示建議、要求、命令等意義的被動結(jié)構(gòu)中，that從句中的謂語動詞常用(should) do。（參見虛擬語氣部分）It is suggested that the meeting (should) be held this afternoon. 會議被建議在下午舉行It is demanded that he (should) leave at once. 他被要求立即離開(4) It + seem/happen/appear等不及物動詞 + that從句。It seems that he is wrong. 看起來似乎他錯了It appears that they are in need of help. 看起來他們需要幫助 2. whether引導(dǎo)主語從句，意為“是否”，只起連接作用，不充當(dāng)任何成分。（置于句首時(shí)必須用whether引導(dǎo)，置于句尾時(shí)，間或可用if。）Whether he will win the game is not clear. 他是否會贏得比賽還不清楚。 Whether he will come is uncertain. 他是否會來還不確定It is not clear whether/if he will come.It was uncertain whether he would come.3. 連詞代詞what, who, which, whose等引導(dǎo)的主語從句。這些連接代詞作用相當(dāng)于代詞，在從句中擔(dān)當(dāng)主語、賓語、表語、定語等。What we need is more time. 我們需要的是更多時(shí)間Who was responsible for the accident is not yet clear. 誰應(yīng)該對這場事故負(fù)責(zé)還不清楚。Whose book it is not important. 這是誰的書并不重要。Which school you want to go matters much. 你想去哪所學(xué)校很重要4.連接副詞when, where, why, how引導(dǎo)的主語從句。這些連接副詞相當(dāng)于副詞，在從句中充當(dāng)狀語。Why he did this is not known. 他為什么做這件事還不知道。When he will come is still unknown. 他什么時(shí)候來還不知道。It is not known why he did this. 他為什么做這件事還不知道注意：wh-引導(dǎo)的主語從句也常用it作形式主語。5.也可用whatever,whoever,whomever,whenever,wherever等詞引導(dǎo)主語從句，表示“無論什么”、“無論誰”、“無論何時(shí)”、“無論在（到）哪里”等。Whatever he g