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主题 : 2021年考博英语语法讲解之名词性从句用法
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楼主  发表于: 2021-02-22   

2021年考博英语语法讲解之名词性从句用法

 名词性从句相当于名词,可用作主句的主语、表语、宾语和同位语。因此,名词性从句分为主语从句、表语从句、宾语从句和同位从句。引导名词性从句的连接词有:连接代词:who, whose, whom, what, which,有词义,在从句中担任成分,如主语、表语、宾语、或定语等;连接副词:when, where, why, how,有词义,在从句中担任成分,作状语;连接词:that, whether, if, as if,if (whether), as if虽有词义,但在从句中不担任成分;that 无词义,在从句中不担任成分,有时可省略。 B~CdY}UTsj  
  今后对名词性从句的考查仍将集中在关联词的选用上,特别石堆what引导的名词性从句的考查。名词性从句与其他从句的混合考查将在今后高考中占据一席之地。易混句型的辨析,比如it作形式主语,主语从句后置的句型与强调句型的辨析将仍作为高考考查的重点。 RXi/&'+H  
  【知识点归纳】 rW P -Rm  
  名词性从句的用法 QX`T-)T e  
  在句子中起名词作用的句子叫名词从句 (Noun Clauses)。 名词从句的功能相当于名词词组, 它在复合句中能担任主语、宾语、表语、同位语、介词宾语等,因此根据它在句中不同的语法功能,名词从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。 9hTzi+'S  
  一、引导名词性从句的连接词 up@I,9C/  
  引导名词性从句的连接词可分为三类:连词:that(无任何词意);whether, if(均表示“是否”表明从句内容的不确定性);as if ,as though(均表示“好像”,“似乎”)。 fi,h`mdT?  
  以上在从句中均不充当任何成分 9n#lDL O  
  连接代词:what, whatever, who, whoever, whom, whose, which. Whichever, whomever yrF"`/zv6|  
  连接副词:when, where, how, why ^H(,^cVN  
  不可省略的连词: +%~/~1  
  1. 介词后的连词 m-HL7&iG$  
  2. 引导主语从句和同位语从句的连词不可省略。 ;:]#Isq  
  That she was chosen made us very happy. 6Mj (B*c  
  We heard the news that our team had won. .N>Th/K8  
  比较: W^k|*Y|  
  Whether与if 均为"是否"的意思。 但在下列情况下,whether 不能被if 取代: M%z$yU`ac  
  1. Whether引导主语从句并在句首; ,\RZ+kC>~  
  2. 引导表语从句 V{{Xz:   
  3. Whether从句作介词宾语; _)U .5f<   
  4. 从句后有"or not" I^l\<1"]  
  Whether he will come is not clear. $X_A 74 (  
  大部分连接词引导的主语从句都可以置于句末,用 it充当形式主语。 s qEOXO  
  It is not important who will go. MJM<  
  It is still unknown which team will win the match. d=DQS>Nz  
  二、具体分类 )?MUUI:  
  1.主语从句 #8/pY Q;  
  作句子主语的从句叫主语从句。主语从句通常由从属连词that,whether,if和连接代词what,who,which,whatever,whoever以及连接副词how,when,where,why等词引导。that在句中无词义,只起连接作用;连接代词和连接副词在句中既保留自己的疑问含义、又起连接作用,在从句中充当从句的成分。例如: }pJLK\  
  What he wants to tell us is not clear. 他要跟我们说什么,还不清楚。 l3:2f-H   
  Who will win the match is still unknown. 谁能赢得这场比赛还不得而知。 tyU'[LF?  
  It is known to us how he became a writer. 我们都知道他是如何成为一名作家的。 w(oi6kg  
  Where the English evening will be held has not yet been announced. 英语晚会将在哪里举行,还没有宣布。 ZZ324UuATX  
  【典例1】It is immediately clear ____ the financial crisis will soon be over. H(gETRh  
  A. since B. what C. when D. whether IBz)3gj J  
  【答案】D WD>z  
  【解析】考查主语从句的用法。该句的意思时:经济危机是否会很快结束是很明显的事情。“是否”用whether表示,不能选when是因为从句中由soon这一实践状语。 4q)+nh~s  
  【典例2】_____ was most important to her, she told me, was her family. >/+R~ n  
  A. It B. This C. What D. As s# V>+mU  
  【答案】C :pdl2#5H^  
  【解析】she told me是插入语,可删除。what引导主语从句,在从句中充当主语。 [?55vYt  
  有时为避免句子头重脚轻,常用形式主语it代替主语从句作形式主语放于句首,而把主语从句置于句末。主语从句后的谓语动词一般用单数形式。常用句型如下: ;-^8lWt  
  (1)It + be + 名词 + that从句 KA? J:  
  (2)It + be + 形容词 + that从句 }u]7x:lh  
  (3)It + be + 动词的过去分词 + that从句 l.xKv$uOGR  
  (4)It + 不及物动词 + that 从句 _P9*78  
  另注意在主语从句中用来表示惊奇、不相信、惋惜、理应如此等语气时,谓语动词要用虚拟语气“(should) +do”,常用的句型有: 4x-K0  
  It is necessary (important, natural, strange, etc.) that … \DcO .`L  
  It is a pity (a shame, no wonder, etc.) that… MNf^ml[  
  It is suggested (requested, proposed, desired, etc.) that… E5yn,-GyE0  
  【典例】It is obvious to the students ______ they should get well prepared for their future. 4hx4/5[^  
  A. as B. which C. whether D. that )fl+3!tq  
  【答案】D 5><T#0W?  
  【解析】考查名词性从句。本空格处应是一个主语从句的引导词,因该主语从句不缺成分,且句意完整,故应用不作任何成分的连词that。  }=d}q *  
  2.宾语从句 0"{-<Wot}  
  名词句用作宾语的从句叫宾语从句。引导宾语从句的关联词与引导主语从句表语从句的关联词大致一样,在句中可以作谓语动词或介词及非谓语动词的宾语。 G_`Ae%'h  
  (1) 由连接词that引导的宾语从句 w!jY(WK U  
  由连接词that引导宾语从句时,that在句中不担任任何成分,在口语或非正式的文体中常被省去,但如从句是并列句时,第二个分句前的that不可省。例如: ue*o>iohB  
  He has told me that he will go to Shanghai tomorrow. 他已经告诉我他明天要去上海。 "(mF5BE-E  
  We must never think (that) we are good in everything while others are good in nothing. 我们决不能认为自己什么都好,别人什么都不好。 $IqubC>O  
  注意:在demand,order,suggest,decide,insist,desire,request,command等表示要求、命令、建议、决定等意义的动词后,宾语从句常用“(should)+ 动词原形”。例如: / 5/m x  
  I insist that she (should) do her work alone. 我坚持要她自己工作。 TN/y4(j  
  The commander ordered that troops (should) set off at once. 司令员命令部队马上出发。 m=25HH7enb  
  (2)用who,whom, which, whose, what, when, where, why, how, whoever, whatever, whichever等关联词引导的宾语从句相当于特殊疑问句,应注意句子语序要用陈述语序。例如: hi/Z>1ZOX  
  I want to know what he has told you. 我想知道他告诉了你什么。 mD%IHzbn H  
  She always thinks of how she can work well. 她总是在想怎样能把工作做好。 3Ww 37V>h  
  She will give whoever needs help a warm support. 凡需要帮助的人,她都会给予热情的支持。 vxS4YRb  
  【典例1】The companies are working together to create _______ they hope will be the best means of transport in the 21st century. ( 7ujJ}#,  
  A. which B. that C. what D. who  niyI$OC  
  【答案】C &3Lhb}m  
  【解析】create后为宾语从句,从句中they hope是插入语,可删除。因为从句中缺少主语,所以用what引导该从句。 ZiPz~G0[^  
  【典例2】Could I speak to is in charge of International Sales please? 6xFchdMG{m  
  A. who B. what C. whoever D. whatever U6.hH%\}@  
  【答案】C ~~@dbB  
  【解析】 考查名词性从句。题干中介词to后面为宾语从句,从句中缺少主语,因此填whoever。 sR^b_/ElxT  
  (3)用whether或if引导的宾语从句,其主语和谓语的顺序也不能颠倒,仍保持陈述句语序。此外,whether与if 在作“是否”的意思讲时在下列情况下一般只能用whether,不用if: ' g d=\gV  
  a. 引导主语从句并在句首时;b. 引导表语从句时;c . 引导从句作介词宾语时;d. 从句后有“or not”时;e. 后接动词不定式时。例如: w '9!%mr  
  Whether there is life on the moon is an interesting question. 月球上有没有生命是个有趣的问题。 Y`3\Z6KlV  
  The question is whether she should have a low opinion of the test? Zs8]A0$  
  Everything depends on whether we have enough money. 一切要看我们是否有足够的钱。 qHvU4v  
  I wonder whether he will come or not. 我想知道他来还是不来。 M9G?^mW1sT  
  Can you tell me whether to go or to stay? 你能否告诉我是去还是留? bVzJOBe  
  (4)注意宾语从句中的时态呼应,当主句动词是现在时,从句根据自身的句子情况,而使用 6s>io%,:  
  不同时态。例如: Ta$55K0  
  he studies English every day. (从句用一般现在时) KWM.e1(  
  he studied English last term. (从句用一般过去时) ]L2b|a3  
  I know (that) he will study English next year. (从句用一般将来时) x.$cP  
  he has studied English since 1998. (从句用现在完成时) Dp4x\97O  
  当主句动词是过去时态(could, would除外),从句则要用相应的过去时态,如一般过去时,过去进行时,过去将来时等;当从句表示的是客观真理,科学原理,自然现象,则从句仍用现在时态。例如: o_BRsJy  
  The teacher told us that Tom had left us for America. V`9*_8Dx2  
  (5)think, believe, imagine, suppose等等动词引起的否定性宾语从句中,要把上述主句中的动词变为否定式。即将从句中的否定形式移到主句中。例如: 8llXpe  
  We don’t think you are here. 我们认为你不在这。 1CR\!?  
  I don’t believe he will do so. 我相信他不会这样做。 7rYBFSp  
  3.表语从句 =l:k($%%  
  在句中作表语的从句叫表语从句。引导表语从句的关联词与引导主语从句的关联词大致一样,表语从句位于连系动词后,有时用as if引导。其基本结构为:主语 + 系动词 + that从句。例如: e1y#p3 @d  
  The fact is that we have lost the game. 事实是我们已经输了这场比赛。 p+5J  
  That’s just what I want. 这正是我想要的。 E;9J7Q 4  
  This is where our problem lies. 这就是我们的问题所在。 X|&H2y|*7  
  That is why he didn’t come to the meeting. 那就是他为什么不到会的原因。 q<Qjc  
  It looks as if it is going to rain. 看上去天要下雨了。 ^I yYck'y+  
  需要注意的,当主语是reason时,表语从句要用that引导而不是because。例如: io(!z-$  
  The reason why he was late was that he missed the train by one minute this morning . vxug>2  
  【点拨】whether 可引导表语从句,但与之同义的if却通常不用于引导表语从句。 sSc~q+xz  
  【典例1】The little girl who got lost decided to remain ________she was and wait tor her mother. 2h#.:!/SMw  
  A. where B. what C. how D. who ~]].i~EV(  
  【答案】A ,CN (;z)  
  【解析】remain是系动词,后加表语从句,由句意可知,从句缺地点状语,所以选A。 R]o0V*n  
  【典例2】The last time we had grat fun was _______ we were visiting the Water Park. O}(sn  
  A. where B. how C. when D. why 2(x| %  
  【答案】C ExN $J  
  【解析】was后为表语从句,此处when与the last time相呼应,根据句意可排除其他选项。 &5.J y2hO]  
  4. 同位语从句 FFcIOn  
  同位语从句说明其前面的名词的具体内容。同位语从句通常由that引导,可用于同位语从句的名词有advice,demand,doubt,fact,hope,idea,information,message,news,order,problem,promise,question,request,suggestion,truth,wish,word等。例如: CrSBN~  
  The news that we won the game is exciting. 我们赢得这场比赛的消息令人激动。 Q2)(tB= )  
  I have no idea when he will come back home. 我不知道他什么时候回来。 A:D9qp  
  The thought came to him that Mary had probably fallen ill. 他想到可能玛丽生病了。 .t8hTlV?<B  
  【典例】We should consider the students’ request ________ the school library provide more books on popular science. {:b~^yW  
  A. that B. when C. which D. where ,G-  
  【答案】A Z_edNf }|  
  【解析】考查名词性从句。根据题意知,空格处是同位语从句的引导词,修饰中心名词request,且在句子中不充当成分,故用that。这句话的意思是我们应该考虑学生的这个要求,即学校图书馆应该多提供一些大众科学方面的书籍。 "FhC"}N  
  三、对比与用法 nP<u.{q L  
  1.同位语从句和定语从句的区别: hOk n@F.  
  that作为关系代词,可以引导定语从句,充当句子成分,在从句中作宾语时可以省略; that引导同位语从句时,起连词的作用,没有实际意义,不充当句子成分,一般不能省略。 Slj U=,  
  试比较下面两个例句: sDR Av%w  
  I had no idea that you were here.(that引导同位语从句,不能省略) + !" Y C  
  Have you got the idea(that)this book gives you of life in ancient Greece?(that引导定语从句,作宾语,可以省略) hoM %|,0  
  2.that-从句作主语通常用it作先行词,而将that-从句置于句末。 tw =A] a*  
  用it作形式主语的that-从句有以下四种不同的搭配关系: 9;uH}j8sE  
  a. It + be +形容词+ that-从句 k@s<*C  
  It is necessary that… 有必要…… EVBOub V  
  It is important that… 重要的是…… N` $F>E,T%  
  It is obvious that… 很明显…… p&u\gSo  
  b. It + be + -ed 分词+ that-从句 m xBx?xM-  
  It is believed that… 人们相信…… [i.c;'Wy/  
  It is known to all that… 从所周知…… _?y3 &4N)  
  It has been decided that… 已决定…… dZ8ldpf8  
  c. It + be +名词+ that-从句 isy[RAP<  
  It is common knowledge that… ……是常识 Y:#B0FD,gC  
  It is a surprise that… 令人惊奇的是…… .Ln98#ZR  
  It is a fact that… 事实是…… c`hENPhW  
  d. It +不及物动词+ that-分句 -sdzA6dp  
  It appears that… 似乎…… *GY8#Az  
  It happens that… 碰巧…… xdDe@G;"  
  It occurred to me that… 我突然想起…… "#gS?aS  
  It is quite clear that the whole project is doomed to failure. 0u&x%c  
  很清楚,整个计划注定要失败。 ut]UU*g^$  
  It's a pity that you should have to leave. TuPD5-wB&  
  你非走不可真是件憾事。 ,quUGS  
  3.否定转移 $c uBd  
  (1) 将think, believe, suppose, expect, fancy, imagine等动词后面宾语从句的否定词转移到主句中,即主句的谓语动词用否定式,而从句的谓语动词用肯定式。 \CE+P5  
  I don't think I know you. 我想我并不认识你。 0%;| B  
  I don' t believe he will come. 我相信他不回来。 M #0v# {o  
  注意:若谓语动词为hope,宾语从句中的否定词不能转移。 1:- M<=J?f  
  I hope you weren't ill. 我想你没有生病吧。 ]N0 B.e~D  
  (2)将seem, appear 等后的从句的否定转移到前面。 n9 FA` e  
  It doesn't seem that they know where to go. \o3s&{+ y,  
  看来他们不知道往哪去。 d(d3@b4Ta  
  It doesn't appear that we'll have a sunny day tomorrow. ^jdtp  
  看来我们明天不会碰上好天气。 I(3~BOUn_  
  【备考策略】 /X0<2&v  
  考生对于名词性从句的复习和应试关键要把握每个引导词的意义,因为在对于名词性从句的考查中,引导词在句子中都起作用,有意义,因此在分析句子结构,对比辨别名词性从句、状语从句、强调句式后,最后还是要选择引导词;另外还要注意以下几点: <^Y #q  
  1.what 引导词的考查,尤其位于介词后引导的宾语从句以及引导名词性从句时的双重作用。 nRw.82eK.  
  2.Whether和if 的区别,尤其注意他们的不同之处。 )+hJi/g  
  3.名词性从句和其它从句的兼容结构测试。 Er8F_,M+  
  4.句子语序和时态。 .YH# +T'  
  具体说: $AvaOI.l  
  1.掌握名词性从句的分类功能 y?3u6q++  
  名词性从句根据其在主句的功能作用又可分为主语从句、宾语从句、表语从句和同位语从句。 Au/'|%2#(  
  (1) 若从句在句中作主语为主语从句 nehk8+eV_  
  (2) 若从句在句中作宾语为宾语从句 FEopNDy@y  
  (3)若从句在句中作表语为表语从句 @m:' L7+  
  (4) 若从句在句中作同位语为同位语从句 A,4} $-7  
  2.掌握连词的含义及分类 iWUxB28  
  绝大多数名词性从句的连词都有其实在意义,称为有义连词,如what表“……的内容”,when表“……的时间”,where表“……的地点”,why表“……的原因”,how表“如何;怎样”,who表“谁”,if, whether表“是否”;没有实在意义的连词叫无义连词,无义连词只有that一个。 :x3DuQP  
  3.掌握名词性从句的语序 )PkGT~3I  
  名词性从句用陈述语序。 Dk")/ ib  
  4.掌握名词性从句和其它从句之间的关系 8(A k  
  有些连词除引导名词性从句外还可引导其它从句,应掌握它们之间的关系。 LS# _K-  
  (1) if ,whether表"是否"时引导名词性从句;if表“如果”时引导条件状语从句;whether表“无论是否;不管是否”时引导让步状语从句。 i1b3>H*3  
  (2) when表“……的时间”,where表“……的地方”时引导名词从句;when表“当……的时候”引导时间状语从句,where表“……的地方”,且修饰行为动词时,引导地点状语从句;when, where从句作定语修饰先行词时引导定语从句。 &@2`_%QtA  
  【专题巩固】 aK,\e/Oo  
  1. A warm thought suddenly came to me _______I might use the pocket money to buy some flowers for my mother’s birthday . g&ba]?[A  
  A. if B. when C. that D. which *>o@EUArN  
  2. See the flag on top of the building ? That was _______ we did this morning. $m+Pl[s  
  A when B. which C. where D. what 5$$]ZMof  
  3. The government has announced that a modern city will be set up in _______is still a wasteland now. cj[%.M5iBA  
  A. what B. which C. that D. where ?ia O6HD  
  4.Many people wrote articles on _______Liu Xiang had failed to compete in the event . 0d`lugf  
  A. why B. what C. who D. that ,? &$ c+  
  5.The couple are spending their holiday on _______is described as one of the most beautiful islands. O7,:-5h0  
  A. that B. what C. which D. where &,]yqG 2  
  6.The book is meant to _______needs it . L>57eF)7  
  A. who B. whoever C. whomever D. whom j2n 4; m  
  7. In his speech, Premier Wen Jiabao points out that creativity is_______it takes to keep a nation highly competitive. g%4=T~  
  A. how B. what C. which D. that 2qKAO/_O  
  8.The experience of the Chinese nation attests to a truth_______ a nation loses in times of disaster will be made up for by her progress. Mt12 1Q&"  
  A. that what B. what C. that D. what that {UhpN"'"n  
  9._______has recently been done to provide more buses for the people ,a shortage of public vehicles remains a serious problem . gGbqXG^  
  A. That B. What C. In spite of what D. Though what -PiZvge  
  10. _______is certain is _______prevention is more important than treatment. w  /CD-  
  A. It; that B. What; that C. As; what D. What; what fEyc3K'5V  
  11. Nobody would stand out admitting the fact, for some reason, _______they lost the game. !/e8x;_  
  A. that B. which C. what D. why $I\lJ8  
  12.—The patient looks much better. _______is it that has made him_______he is today? ` B+Pl6l)F  
  —Perhaps the special medicine and his family’s patient care. 93Q x+oK]  
  A.What; that B.That; that C.What; what D.What; which k@2@%02o9C  
  13. After three hours’ climbing , they reached _______ they thought was the place they’d been dreaming of . 45Q#6Bt E  
  A.what B.which C.where D.that YzAGhAyw  
  14. A plan has been put forward _______more graduates should go to work in the country L0xh?B  
  A. when B. that C. whether D. how xEe3,tb'e  
  15.It is pretty well understood _______controls the flow of carbon dioxide in and out the atmosphere today. (R{z3[/u&  
  A. that B. when C. what D. how I;?np  
  【参考答案及解析】 Hb9r.;r<EW  
  1. C 句意:我脑海中突然出现一个温情的念头,用我的零花钱给妈妈买些鲜花作为她的生日礼物。本题考察名词性从句用法。I might use the pocket money to buy some flowers for my mother’s birthday .做A warm thought 的同位语从句。中间被suddenly came to me隔开,增加了试题难度。此外,部分考生由于对同位语从句和定语从句不分,故错选D为答案。 N*>&XJ#  
  2. D 表语从句中缺did的宾语。 8d\/  
  3. A “_______is still a wasteland now .”做介词in的宾语从句,从句中缺主语句意为:政府已经宣布一座现代化的城市将在这片现在仍是废墟的地方建成。 st(Y{Gs  
  4. A“_______Liu Xiang had failed to compete in the event.”做介词on的宾语,宾语从句中不缺主干,故排除B和C。另外that不引导介词的宾语从句(固定搭配除外),所以排除D。 DYL\=ya1  
  5. B “_______is described as one of the most beautiful islands .”宾语从句,从句中缺少主语, ;8<lgZ9H<  
  6. B whoever在宾语从句中做主语,部分学生,因为只看到介词to,误认为要添whomever做介词的宾语。 p/&s-G F  
  7. B “_______it takes to keep a nation highly competitive.”做表语从句,从句中缺少takes的宾语,构成 it takes sth to do sth 结构。 e&XJK*Wf   
  8. A本题句子结构比较复杂,“_______ a nation loses in times of disaster will be made up for by her progress”做a truth的同位语从句,同位语从句中_______ a nation loses in times of disaster为主语从句。本句共有两个从句,故有两个引导词。句意为“中华民族的经验证明了一个真理,即,一个民族在灾难中失去的,必将从民族的进步中得到补偿。 3=kw{r[2lM  
  9. C “_______has recently been done to provide more buses for the people”在句中做让步状语,而D. Though what错误, 因为, 一个单一的从句不能用两个连词引导.句意: 尽管在为人们提供更多公交车这件事上, 投入了很多, 但是公交工具的缺乏, 仍然是个问题.  ^9*Jz{e  
  10.B “_______is certain”在句中做主语,主语从句缺少一个主语,需要用What; “_______prevention is more important than treatment .”系表语从句,句意与结构完整,只有that,可以这样用。 I~U;M+n*y  
  11.A“_______ they lost the game.”在句子中做the fact 的同位语从句,从句意思结构完整,结构完整。 %;tBWyq}_  
  12. C先将句子结构理清楚,it is _______that has made him _______he is today 就可以判断,第一个空是考察强调句型的特殊疑问形式;第二个空则是表语从句,表语从句中缺少he is的表语。句意:病人好多了,是什么使得他成为现在这个样子。 <o&\/uO~H  
  13. A考生误以为是地点状语从句,误选C.where。而reached是及物动词,后边接的是宾语从句,宾语从句除去插入语they thought,应该缺主语。 J k FZd  
  14.B 考察同位语从句,表达A plan的具体内容,has been put forward将名词与从句隔开,加大了难度。 ln=:E$jX  
  15.C 主要测试主语从句。分析句子结构可知:句子属于形式主语格式;另外主句中缺少主语。双重作用的引导词只能是what。例如:It is still doubtful what he said at the meeting yesterday。昨天他在会上说的话仍然值得怀疑。 UNKXfe(X9  
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