【文章內(nèi)容簡介】 況下，whether 不能被if 取代：“or not”大部分連接詞引導(dǎo)的主語從句都可以置于句末，用 it充當(dāng)形式主語。例如：It is not important who will ，這不重要。It is still unknown which team will win the ，形勢尚不明朗。 名詞性that從句 解決高考問題，就上高考圈1）由從屬連詞that引導(dǎo)的從句叫做名詞性that從句。That只起連接主句和從句的作用，在從句中不擔(dān)任任何成分，本身也沒有詞義。名詞性that從句在句中能充當(dāng)主語、賓語、表語、同位語和形容詞賓語。例如：主語：That he is still alive is sheer 。賓語：John said that he was leaving for London on 。表語：The fact is that he has not been seen 。同位語：The fact that he has not been seen recently disturbs everyone in his ，這一情況令辦公室所有的人不安。形容詞賓語：I am glad that you are satisfied with your 。2）That從句作主語通常用it作先行詞，而將that從句置于句末。例如：It is quite clear that the whole project is doomed to ，整個計劃注定要失敗。It39。s a pity that you should have to 。用it作形式主語的that從句有以下四種不同的搭配關(guān)系： + be +形容詞+ that從句It is necessary that…有必要……It is important that…重要的是……It is obvious that…很明顯…… + be +ed 分詞+ that從句It is believed that…人們相信……It is known to all that…從所周知……It has been decided that…已決定…… + be +名詞+ that從句It is mon knowledge that………是常識 解決高考問題，就上高考圈It is a surprise that…令人驚奇的是……It is a fact that…事實是…… +不及物動詞+ that分句It appears that…似乎……It happens that…碰巧……It occurred to me that…我突然想起…… 名詞性wh從句1）由wh詞引導(dǎo)的名詞從句叫做名詞性wh從句。Wh詞包括who, whom,.whose, whoever, what, whatever, which, whichever等連接代詞和where, when, how, why等連接副詞。Wh從句的語法功能除了和that從句一樣外，還可充當(dāng)介詞賓語、賓語補語和間接賓語等。例如：主語： How the book will sell depends on its 。直接賓語：In one39。s own home one can do what one 。間接賓語：The club will give whoever wins a 。表語： My question is who will take over president of the 。賓語補足語：She will name him whatever she wants 。同位語：I have no idea when he will 。形容詞賓語：I39。m not sure why she refused their 。介詞賓語： That depends on where we shall 。2）Wh從句作主語也常用先行詞it做形式主語，而將wh從句置于句末。例如：It is not yet decided who will do that 。It remains unknown when they are going to get 。 if, whether引導(dǎo)的名詞從句1）yesno型疑問從句 解決高考問題，就上高考圈從屬連詞if, whether引導(dǎo)的名詞從句是由一般疑問句或選擇疑問轉(zhuǎn)化而來的，因此也分別被稱為yesno型疑問句從句和選擇型疑問從句，其功能和wh從句的功能相同。例如：主語：Whether the plan is feasible remains to be 。賓語：Let us know whether / if you can finish the article before 。表語：The point is whether we should lend him the 。同位語：They are investigating the question whether the man is 。形容詞賓語： She39。s doubtful whether we shall be able to 。介詞賓語： I worry about whether he can pass through the crisis of his 。2）選擇性疑問從句選擇性疑問從句由關(guān)聯(lián)詞if/whether…or或whethe…or not構(gòu)成。例如：Please tell me whether / if they are Swedish or 。I don39。t care whether you like the plan or 。 否定轉(zhuǎn)移1）將think, believe, suppose, expect, fancy, imagine等動詞后面賓語從句的否定詞轉(zhuǎn)移到主句中，即主句的謂語動詞用否定式，而從句的謂語動詞用肯定式。例如：I don39。t think I know 。I don39。 t believe he will 。注意：若謂語動詞為hope,賓語從句中的否定詞不能轉(zhuǎn)移。例如：I hope you weren39。t 。2）將seem, appear 等后的從句的否定轉(zhuǎn)移到前面。例如：It doesn39。t seem that they know where to 。It doesn39。t appear that we39。ll have a sunny day 。 解決高考問題，就上高考圈3）有時將動名詞，介詞短語或整個從句的否定轉(zhuǎn)變?yōu)閷χ^語動詞的否定。例如：I don39。t remember having ever seen such a 。（not否定動名詞短語 having…）It39。s not a place where anyone would expect to see strange characters on the ，人們不會想到在街上會碰上陌生的人。（anyone 作主語，從句中的謂語動詞不能用否定形式。）4）有時狀語或狀語從句中否定可以轉(zhuǎn)移到謂語動詞前。例如：The ant is not gathering this for itself alone.（否定狀語）螞蟻不只是為自己采食。He was not ready to believe something just because Aristotle said so.（否定because狀語）他并不因亞里斯多德說過如何如何，就輕信此事。She had not been married many weeks when that man39。s younger brother saw her and was struckby her beauty.（否定狀語many weeks）她結(jié)婚還不到幾個月，這個人的弟弟就看見她了，并對她的美貌著了迷。第三篇：高中二輪英語語法復(fù)習(xí)講解名詞性從句嘉興英語教學(xué)網(wǎng) 收集整理 歡迎使用高中英語語法之名詞性從句在句子中起名詞作用的句子叫名詞性從句(Noun Clauses）。名詞性從句的功能相當(dāng)于名詞詞組, 它在復(fù)合句中能擔(dān)任主語、賓語、表語、同位語、介詞賓語等，因此根據(jù)它在句中不同的語法功能，名詞性從句又可分別稱為主語從句、賓語從句、表語從句和同位語從句。一、引導(dǎo)名詞性從句的連接詞引導(dǎo)名詞性從句的連接詞可分為三類：連詞：that（無任何詞意）whether,if（均表示“是否”表明從句內(nèi)容的不確定性）as if ,as though（均表示“好像”，“似乎”）以上在從句中均不充當(dāng)任何成分連接代詞：what, whatever, who, whoever, whom,whose, whichever,whomever 連接副詞：when, where, how, why,how many,how much,how often 不可省略的連詞： 。That she was chosen made us very heard the news that our team had ：whether與if 均為“是否”的意思。但在下列情況下，只可用whether： “or not”Whether he will e is not ，用 it充當(dāng)形式主語。It is not important who will is still unknown which team will win the 作句子主語的從句叫主語從句。主語從句通常由從屬連詞that，whether，if和連接代詞what，who，which，whatever，whoever以及連接副詞how，when，where，why等詞引導(dǎo)。that在句中無詞義，只起連接作用；連接代詞和連接副詞在句中既保留自己的疑問含義、又起連接作用，在從句中充當(dāng)從句的成分。例如：What he wants to tell us is not ，還不清楚。Who will win the match is still 。It is known to us how he became a 。Where the English evening will be held has not yet been ，還沒有宣布。有時為避免句子頭重腳輕，常用形式主語it代替主語從句作形式主語放于句首，而把主語從句置于句末。主語從句后的謂語動詞一般用單數(shù)形式。常用句型如下：（1）It + be + 名詞 + that從句（2）It + be + 形容詞 + that從句（3）It + be + 動詞的過去分詞 + that從句（4）It + 不及物動詞 + that 從句另注意在主語從句中用來表示驚奇、不相信、惋惜、理應(yīng)如此等語氣時，謂語動詞要用虛擬語氣“(should)+do”，常用的句型有：It is necessary(important, natural, strange, etc.)that …It is suggested(requested, proposed, desired, etc.)that…嘉興英語教學(xué)網(wǎng) 收集整理 歡迎使用（5）What caused the accident remains unknown.（6）Whatever you did is right.（7）Who the watch belongs to was lost is unknown.（8）What we need is time.（9）What we need are good :（1)引導(dǎo)主語從句連詞有that,whether,who,what,whatever等（2)連詞位于句首不能省略（3)主語從句大多數(shù)情況下視為三單,但也有例外,如例9嘉興英語教學(xué)網(wǎng) 收集整理 歡迎使用(3)It happens…, It occurs… 結(jié)構(gòu)中的主語從句不可提前。例如：It occurred to him that he failed in the examination.(4)It doesn’t matter how/whether …結(jié)構(gòu)中的主語從句不可提前。例如：It doesn’t matter whether he is wrong or not.(5)含主語從句的復(fù)合句是疑問句時，主語從句不可提前。例如：Is it likely that it will rain in the evening? 與that 在引導(dǎo)主語從句時的區(qū)別What 引導(dǎo)主語從句時在從句中充當(dāng)句子成分，如主語．賓語．表語，而that 則不然。例如： What you said yesterday is 、賓語從句名詞句用作賓語的從句叫賓語從句。引導(dǎo)賓語從句的關(guān)聯(lián)詞與引導(dǎo)主語從句表語從句的關(guān)聯(lián)詞大致一樣，在句中可以作謂語動詞或介詞及非謂語動詞的賓語。由連接詞that引導(dǎo)賓語從句時，that在句中不擔(dān)任任何成分，在口語或非正式的文體中常被省去，但如從句是并列句時, 嘉興英語教學(xué)網(wǎng) 收集整理 歡迎使用現(xiàn)在時態(tài)。例如：The teacher told us that Tom had left us for America．, believe, imagine, suppose等等動詞引起的否定性賓語從句中，要把上述主句中的動詞變?yōu)榉穸ㄊ?。即將從句中的否定形式移到主句中。例如?We don’t think you are 。I don’t believe he will do 。：，從句可用任意時態(tài)。，從句用過去某個時態(tài)。，從句是客觀真理時，只用一般現(xiàn)在時。從屬連詞：連接賓語從句的從屬連詞主要有that,if,而if和whether引導(dǎo)表示“是否” told me that he would go to the college the next d