教育专题：高中定语从句讲解及练习（57张）.ppt

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1、定语从句讲解及练习1在做定语从句练习时，避免以下错误观在做定语从句练习时，避免以下错误观点：点：先行词表示时间用 when引导定语从句先行词表示地点用where引导定语从句先行词表示原因（reason）用why 引导定语从句2正确的思路正确的思路:“两找一看两找一看”看先行词在定语从句中所做的成分，做看先行词在定语从句中所做的成分，做主语主语宾语用关系代词，做状语用关系副宾语用关系代词，做状语用关系副词。词。介词介词+which=关系副词关系副词（介词+which表示时间=when;表示地点=where;for which表示原因=why）3第一步第一步,确定主句和先行词（定语从句所确定主句和

2、先行词（定语从句所修饰的词）修饰的词）第二步，把先行词放在不完整的句子中第二步，把先行词放在不完整的句子中（定语从句），构成一个完整的句子（定语从句），构成一个完整的句子（考虑定语从句的谓语有时需要加入适（考虑定语从句的谓语有时需要加入适当的介词，才能放入先行词）当的介词，才能放入先行词）第三步，选用适当的关系代词或副词替第三步，选用适当的关系代词或副词替代。代。第四步，第四步，把关系代词或副词放在定语从把关系代词或副词放在定语从句句首，然后放在先行词的后边句句首，然后放在先行词的后边4The man _ you talked just now is my neighbor.A that B

3、with which C with whom D whom第一步：主句：第一步：主句：The man is my neighbor;先行词：先行词：the man 第二步：第二步：the man 放在定语从句中，不可以说放在定语从句中，不可以说you talked the man just now,根据根据talk 的词法知识，需要加介词的词法知识，需要加介词with 才能跟宾语：才能跟宾语：you talked with the man just now第三步：第三步：the man 在定语从句充当宾语，指人，我们用在定语从句充当宾语，指人，我们用whom 替代替代You talked wi

4、th whom just now第四步：第四步：The man whom you talked with just now is my neighbor.根据所给答案，我们可以判断，定语从句的介根据所给答案，我们可以判断，定语从句的介词词with 提前，因此我们选提前，因此我们选56定语从句定语从句一、定语从句概述 The story that you read is The Rescue.你读的故事叫营救。The story是“先行词”，that you read是定语从句，that是关系代词。（一）概念 7定语从句定语从句（二）使用关系代词还是关系副词（二）使用关系代词还是关系副词（二）使

5、用关系代词还是关系副词（二）使用关系代词还是关系副词当引导词在句中当引导词在句中当引导词在句中当引导词在句中作主语或宾语作主语或宾语作主语或宾语作主语或宾语时，要用关系时，要用关系时，要用关系时，要用关系代代代代词；词；词；词；当引导词在句中当引导词在句中当引导词在句中当引导词在句中作状语作状语作状语作状语时，要用关系时，要用关系时，要用关系时，要用关系副副副副词。如：词。如：词。如：词。如：This is the palace This is the palace where he workswhere he works.(where.(where状语时，状语时，状语时，状语时，等于等于等于

6、等于in which)in which)I often think of the days I often think of the days that I spent in Browns that I spent in Browns last summerlast summer.(that.(that作作作作spentspent的宾语的宾语的宾语的宾语=the days)the days)He kept the laughing during the two hours He kept the laughing during the two hours(that)(that)it took

7、to fly to Beijingit took to fly to Beijing.(that.(that作作作作tooktook的宾语，等于的宾语，等于的宾语，等于的宾语，等于two two hours)hours)8定语从句定语从句（三）定语从句的分类（三）定语从句的分类（三）定语从句的分类（三）定语从句的分类 定定定定语语语语从从从从句句句句分分分分为为为为限限限限制制制制性性性性定定定定语语语语从从从从句句句句和和和和非非非非限限限限制制制制性性性性定定定定语语语语从从从从句句句句，如：如：如：如：My My brother brother who who lives lives i

8、n in New New YorkYork has has six six children.children.（限制性定语从句）（限制性定语从句）（限制性定语从句）（限制性定语从句）我我我我住住住住在在在在纽纽纽纽约约约约的的的的那那那那个个个个兄兄兄兄弟弟弟弟有有有有六六六六个个个个孩孩孩孩子子子子。（我我我我的的的的兄兄兄兄弟弟弟弟不不不不只一个。住在纽约的那位只是其中之一。）只一个。住在纽约的那位只是其中之一。）只一个。住在纽约的那位只是其中之一。）只一个。住在纽约的那位只是其中之一。）My My brother,brother,who who lives lives in in Ne

9、w New YorkYork,has has six six children.children.（非限制性定语从句）（非限制性定语从句）（非限制性定语从句）（非限制性定语从句）我我我我兄兄兄兄弟弟弟弟有有有有六六六六个个个个孩孩孩孩子子子子，他他他他住住住住在在在在纽纽纽纽约约约约。（我我我我只只只只有有有有一一一一个个个个兄兄兄兄弟，且他住在纽约。）弟，且他住在纽约。）弟，且他住在纽约。）弟，且他住在纽约。）9定语从句定语从句 She has found the necklace She has found the necklace(that)she lost two(that)she l

10、ost two weeks agoweeks ago.1 1、限制性定语从句、限制性定语从句、限制性定语从句、限制性定语从句 限限限限制制制制性性性性定定定定语语语语从从从从句句句句在在在在意意意意义义义义上上上上不不不不可可可可缺缺缺缺少少少少的的的的定定定定语语语语，如如如如果果果果去去去去掉掉掉掉，主主主主句句句句的的的的意意意意思思思思就就就就不不不不完完完完整整整整或或或或失失失失去去去去意意意意义义义义。这这这这种种种种从从从从句句句句和主句的关系十分密切，写时和主句的关系十分密切，写时和主句的关系十分密切，写时和主句的关系十分密切，写时不用不用不用不用逗号分开，如：逗号分开，如：

11、逗号分开，如：逗号分开，如：How do you apologize to your friendHow do you apologize to your friend whose bike whose bike you lostyou lost?10定语从句定语从句 Helen,Helen,who was sitting on my leftwho was sitting on my left,said that this said that this meal was the best she had ever had.meal was the best she had ever had.

12、2 2、非非非非限限限限制制制制性性性性定定定定语语语语从从从从句句句句和和和和主主主主句句句句的的的的关关关关系系系系不不不不是是是是十十十十分分分分密密密密切切切切，只只只只是是是是对对对对先先先先行行行行词词词词作作作作些些些些附附附附加加加加的的的的说说说说明明明明，如如如如果果果果去去去去掉掉掉掉，主主主主句句句句的的的的意意意意思思思思仍仍仍仍然然然然很很很很清清清清楚楚楚楚。这这这这种种种种从从从从句句句句和和和和主主主主句句句句之之之之间间间间往往往往往往往往用用用用逗逗逗逗号号号号分开，一般不用分开，一般不用分开，一般不用分开，一般不用thatthat 引导。如：引导。如：引

13、导。如：引导。如：Lijiang,Lijiang,where I was bornwhere I was born,is very beautiful.is very beautiful.海伦坐在我的旁边说这时她吃过的最好的海伦坐在我的旁边说这时她吃过的最好的海伦坐在我的旁边说这时她吃过的最好的海伦坐在我的旁边说这时她吃过的最好的一顿饭。一顿饭。一顿饭。一顿饭。3 3、有些定语从句，究竟是限制性还是非限制性、有些定语从句，究竟是限制性还是非限制性、有些定语从句，究竟是限制性还是非限制性、有些定语从句，究竟是限制性还是非限制性的，要根据上下文来判断。的，要根据上下文来判断。的，要根据上下文来判断

14、。的，要根据上下文来判断。11定语从句定语从句（四）关系代词引导的定语从句（四）关系代词引导的定语从句 1、关系代词概述、关系代词概述 关关关关系系系系代代代代词词词词有有有有who,who,whom,whom,that,that,which,which,whosewhose。当当当当先先先先行行行行词词词词指指指指人人人人时时时时用用用用who,who,whomwhom,当当当当先先先先行行行行词词词词指指指指物物物物时时时时用用用用whichwhich;whosewhose是是是是whowho和和和和whichwhich的的的的所所所所有有有有格格格格形形形形式式式式，表表表表示示示示“的

15、的的的”，thatthat既既既既可可可可指指指指人人人人，也也也也可可可可指指指指物物物物。这这这这些些些些关关关关系系系系代代代代词词词词在在在在定定定定语语语语从从从从句句句句中中中中作作作作主主主主语语语语和和和和宾宾宾宾语语语语，作作作作主主主主语语语语时时时时关关关关系系系系代代代代词不可省略，作宾语时可以省略。词不可省略，作宾语时可以省略。词不可省略，作宾语时可以省略。词不可省略，作宾语时可以省略。12定语从句定语从句2 2 2 2、当当当当先先先先行行行行词词词词指指指指人人人人时时时时使使使使用用用用whowhowhowho和和和和whomwhomwhomwhom，若若若若在

16、在在在句句句句中中中中作作作作主主主主语语语语用用用用whowhowhowho；如如如如果果果果作作作作宾宾宾宾语语语语用用用用whomwhomwhomwhom，但但但但在在在在口口口口语语语语中中中中，常常常常用用用用whowhowhowho代替代替代替代替whomwhomwhomwhom，也可以省略。如：，也可以省略。如：，也可以省略。如：，也可以省略。如：The The foreigner foreigner whowho visited visited our our school school yesterdayyesterday is is from Canada.(from Ca

17、nada.(关系代词关系代词关系代词关系代词whowho在从句中作主语在从句中作主语在从句中作主语在从句中作主语)The The girl girl we we met met yesterdayyesterday is is Li Li Leis Leis sister.sister.(关关关关系系系系代词代词代词代词who,whomwho,whom或或或或thatthat在从句中作宾语，已被省略在从句中作宾语，已被省略在从句中作宾语，已被省略在从句中作宾语，已被省略)13定语从句定语从句3 3 3 3、当先行词指物时，用、当先行词指物时，用、当先行词指物时，用、当先行词指物时，用which

18、whichwhichwhich或或或或that.that.that.that.They They planted planted the the trees trees which which/that that dont dont need need much watermuch water.The fish The fish(which)we bought(which)we bought were not fresh.were not fresh.Miss Miss Smith Smith is is the the teacher teacher whose whose househou

19、se caught caught fire fire last weeklast week.4 4 4 4、whosewhosewhosewhose引引引引导导导导定定定定语语语语从从从从句句句句，先先先先行行行行词词词词可可可可是是是是人人人人也也也也可可可可是是是是物物物物，whosewhosewhosewhose在从句中作定语，其后必跟一个名词在从句中作定语，其后必跟一个名词在从句中作定语，其后必跟一个名词在从句中作定语，其后必跟一个名词。如：。如：。如：。如：史密斯老师便是上周房子着火的那名老师。史密斯老师便是上周房子着火的那名老师。史密斯老师便是上周房子着火的那名老师。史密斯老师便是

20、上周房子着火的那名老师。14定语从句定语从句5 5 5 5、thatthatthatthat先先先先行行行行词词词词既既既既可可可可指指指指人人人人又又又又可可可可指指指指物物物物，在在在在从从从从句句句句中中中中作作作作主主主主语语语语或宾语。如：或宾语。如：或宾语。如：或宾语。如：A plane is a machine A plane is a machine that can flythat can fly.Lets Lets ask ask the the man man that that is is reading reading the the book book over o

21、ver therethere.（1 1）The The athlete athlete to to whom whom you you talkedtalked is is a a famous famous runner.runner.6 6 6 6、如果关系代词作介词的宾语时，介词的位置、如果关系代词作介词的宾语时，介词的位置、如果关系代词作介词的宾语时，介词的位置、如果关系代词作介词的宾语时，介词的位置15定语从句定语从句（2 2 2 2）含含含含有有有有介介介介词词词词的的的的短短短短语语语语动动动动词词词词一一一一般般般般不不不不拆拆拆拆开开开开，介介介介词词词词仍仍仍仍放放放放在在

22、在在动词的后面。如：动词的后面。如：动词的后面。如：动词的后面。如：Is this the watch Is this the watch which/that he is which/that he is looking forlooking for?The The old old man man whom/who whom/who the the nurses nurses are are looking looking afterafter is very well now.is very well now.The city The city that she lives inthat

23、she lives in is very far away.is very far away.（3 3 3 3）关关关关系系系系代代代代词词词词thatthatthatthat，whowhowhowho在在在在从从从从句句句句中中中中作作作作介介介介词词词词宾宾宾宾语语语语时时时时，介介介介词词词词不不不不能能能能放放放放在在在在它它它它的的的的前前前前面面面面，只只只只能能能能放放放放在在在在从从从从句句句句中中中中有有有有关关关关动动动动词词词词的的的的后后后后面。如：面。如：面。如：面。如：16定语从句定语从句（4 4 4 4）关关关关系系系系代代代代词词词词whosewhosewhos

24、ewhose也也也也可可可可以以以以在在在在从从从从句句句句中中中中与与与与它它它它所所所所修修修修饰饰饰饰的的的的名词一起作介词宾语。如：名词一起作介词宾语。如：名词一起作介词宾语。如：名词一起作介词宾语。如：The The boss boss in in whose whose company company my my father father workedworked is is a very kind person.a very kind person.Is there anything Is there anything that I can do for youthat I c

25、an do for you?7 7 7 7、只用、只用、只用、只用thatthatthatthat作关系代词的场合作关系代词的场合作关系代词的场合作关系代词的场合 我父亲工作的那个公司的老板是一个非常和善的人。我父亲工作的那个公司的老板是一个非常和善的人。我父亲工作的那个公司的老板是一个非常和善的人。我父亲工作的那个公司的老板是一个非常和善的人。（1 1 1 1）被被被被修修修修饰饰饰饰的的的的先先先先行行行行词词词词为为为为不不不不定定定定代代代代词词词词，如如如如all,all,much,much,everything,everything,anything,anything,nothin

26、g,nothing,none,none,the the one,one,somethingsomething等时，只能用等时，只能用等时，只能用等时，只能用thatthat。如：。如：。如：。如：17定语从句定语从句（2 2）先先先先行行行行词词词词被被被被only,only,very,very,just,just,last,last,one one of,of,all,all,no,no,little,few,anylittle,few,any等词修饰时，只能用等词修饰时，只能用等词修饰时，只能用等词修饰时，只能用thatthat。如：。如：。如：。如：The only thing The

27、only thing that I want to dothat I want to do is to have a rest.is to have a rest.He was the first person He was the first person that passed the examthat passed the exam.（3 3 3 3）先先先先行行行行词词词词是是是是序序序序数数数数词词词词或或或或被被被被序序序序数数数数词词词词修修修修饰饰饰饰时时时时，只只只只用用用用thatthat。如：如：如：如：（4 4）先行词是最高级或被最高级修饰时，只用）先行词是最高级或被最

28、高级修饰时，只用）先行词是最高级或被最高级修饰时，只用）先行词是最高级或被最高级修饰时，只用thatthat。This is the best way This is the best way that can solve the problemthat can solve the problem.18定语从句定语从句（5 5）先行词既有人也有物时，只用）先行词既有人也有物时，只用）先行词既有人也有物时，只用）先行词既有人也有物时，只用thatthat。如：。如：。如：。如：The The film film star star and and her her film film thatth

29、at you you have have just just talked abouttalked about are really very famous.are really very famous.He He brought brought two two cats cats yesterday.yesterday.Now Now I I can can see see the the two two thatthat are playing in the garden are playing in the garden.（6 6 6 6）被修饰词为数词时，只用）被修饰词为数词时，只用）

30、被修饰词为数词时，只用）被修饰词为数词时，只用thatthatthatthat。如：。如：。如：。如：（7 7）如如如如果果果果两两两两个个个个从从从从句句句句，其其其其中中中中一一一一个个个个关关关关系系系系代代代代词词词词用用用用whichwhich引引引引导，则另一个用导，则另一个用导，则另一个用导，则另一个用thatthat以避名重复；如：以避名重复；如：以避名重复；如：以避名重复；如：He He built built up up a a factory factory whichwhich produced produced thingsthings thatthat had ne

31、ver been seen beforehad never been seen before.19定语从句定语从句（8 8）主主主主句句句句是是是是there there bebe结结结结构构构构，修修修修饰饰饰饰其其其其主主主主语语语语的的的的定定定定语语语语从从从从句句句句用用用用thatthat。如：。如：。如：。如：There is a book on the desk There is a book on the desk that that belongs to Frankbelongs to Frank.This is the house This is the house of

32、 of whichwhich the windows face south the windows face south.8 8、只用、只用、只用、只用whichwhich作关系代词的场合。作关系代词的场合。作关系代词的场合。作关系代词的场合。（2 2）引引引引导导导导非非非非限限限限制制制制性性性性定定定定语语语语从从从从句句句句whichwhich可可可可代代代代先先先先行行行行词词词词或或或或者者者者前句，译成前句，译成前句，译成前句，译成“这一点，这件事这一点，这件事这一点，这件事这一点，这件事”。如：。如：。如：。如：Tom came back,Tom came back,which

33、which made us happy made us happy.（1 1）当关系代词前有介词时，只用）当关系代词前有介词时，只用）当关系代词前有介词时，只用）当关系代词前有介词时，只用whichwhich。如：。如：。如：。如：20定语从句定语从句（3）先行词为）先行词为that,时，引导词用时，引导词用which。如：。如：Whats thatWhats that which was put in the carwhich was put in the car?Let Let me me show show you you the the novel novel that that I

34、I borrowed borrowed from from the library the library whichwhich was newly open to us was newly open to us.（4 4）一一一一个个个个句句句句子子子子中中中中有有有有两两两两个个个个定定定定语语语语从从从从句句句句时时时时，为为为为避避避避免免免免重重重重复复复复，一个用一个用一个用一个用thatthat，另一个则用，另一个则用，另一个则用，另一个则用whichwhich。如：。如：。如：。如：9 9、通常要用、通常要用、通常要用、通常要用whowho代表人作关系代词的场合。代表人作关系代

35、词的场合。代表人作关系代词的场合。代表人作关系代词的场合。21定语从句定语从句（1 1）当当当当先先先先行行行行词词词词是是是是oneone，onesones，anyoneanyone或或或或thosethose等等等等，只只只只用用用用whowho。如：。如：。如：。如：AnyoneAnyone whowho does that does that must be mad.must be mad.There is a young man There is a young man whowho wants to see you wants to see you.（2 2）用在）用在）用在）用在

36、there bethere be结构中，主语指人时，只用结构中，主语指人时，只用结构中，主语指人时，只用结构中，主语指人时，只用whowho。如：如：如：如：Those Those whowho dare to break the law dare to break the law will be punished.will be punished.22定语从句定语从句（3 3）当当当当先先先先行行行行词词词词是是是是人人人人，后后后后面面面面有有有有较较较较长长长长修修修修饰饰饰饰语语语语时时时时，只只只只用用用用whowho。如：。如：。如：。如：The The man man that

37、that spoke spoke at at the the meetingmeeting is is our our new new headmaster headmaster whowho had just come from Shanghai had just come from Shanghai.（4 4）为了避免重复或引起歧义，当句子中有两个定）为了避免重复或引起歧义，当句子中有两个定）为了避免重复或引起歧义，当句子中有两个定）为了避免重复或引起歧义，当句子中有两个定语从句，一个用语从句，一个用语从句，一个用语从句，一个用thatthat时，另一个用时，另一个用时，另一个用时，另一个

38、用whowho。如：。如：。如：。如：I met a I met a friendfriend of mine in the park yesterday of mine in the park yesterday who had who had got three gold medals in the Asian Gamesgot three gold medals in the Asian Games.那个在会上讲话的人是我们的新校长，他来自上海。那个在会上讲话的人是我们的新校长，他来自上海。那个在会上讲话的人是我们的新校长，他来自上海。那个在会上讲话的人是我们的新校长，他来自上海。23定

39、语从句定语从句（5 5）当当当当先先先先行行行行词词词词是是是是I I，youyou，hehe，theythey等等等等时时时时（常常常常用用用用于于于于谚谚谚谚语之中）。如：语之中）。如：语之中）。如：语之中）。如：He He who plays with firewho plays with fire gets burned.gets burned.He He who doesnt reach the Great Wallwho doesnt reach the Great Wall is not a true is not a true man.man.不到长城非好汉。不到长城非好汉。不

40、到长城非好汉。不到长城非好汉。玩火自焚。玩火自焚。玩火自焚。玩火自焚。24定语从句定语从句（五）关系副词引导的定语从句（五）关系副词引导的定语从句（五）关系副词引导的定语从句（五）关系副词引导的定语从句 关关关关系系系系副副副副词词词词有有有有why,why,when,when,wherewhere,在在在在定定定定语语语语从从从从句句句句中中中中代代代代替替替替先先先先行行行行词词词词，作作作作状状状状语语语语，不不不不可可可可省省省省略略略略，有有有有时时时时也也也也可可可可用用用用“介介介介词词词词+which”which”代替。代替。代替。代替。Well never forget th

41、e happy timeWell never forget the happy time when we when we worked on the farm.worked on the farm.I still remember the day I still remember the day when I first came to when I first came to BeijingBeijing.1 1、whenwhen指时间，在定语从句中作时间状语。如：指时间，在定语从句中作时间状语。如：指时间，在定语从句中作时间状语。如：指时间，在定语从句中作时间状语。如：25定语从句定语从句

42、 This is the house This is the house where we lived last yearwhere we lived last year.2 2、wherewhere指地点，在定语从句中作地点状语。如：指地点，在定语从句中作地点状语。如：指地点，在定语从句中作地点状语。如：指地点，在定语从句中作地点状语。如：The factory The factory where his father workswhere his father works is in the west is in the west of the city.of the city.3 3、w

43、hywhy指原因，在定语从句中作原因状语，如：指原因，在定语从句中作原因状语，如：指原因，在定语从句中作原因状语，如：指原因，在定语从句中作原因状语，如：There are several reasons There are several reasons why we cant do thatwhy we cant do that.He couldnt give the teacher a good reason He couldnt give the teacher a good reason why why he was late for schoolhe was late for sc

44、hool.26定语从句定语从句 *当当先先行行词词是是way时时，引引导导词词通通常常用用that/in which或不用任何引导词如：或不用任何引导词如：This is the way（that/in which）he did it.27定语从句定语从句（八）定语从句的主谓一致（八）定语从句的主谓一致（八）定语从句的主谓一致（八）定语从句的主谓一致 The recorder The recorder that that hashas been given to me been given to me is home-is home-made.made.1 1、关关关关系系系系代代代代词词词词

45、作作作作从从从从句句句句的的的的主主主主语语语语时时时时，从从从从句句句句中中中中谓谓谓谓语语语语动动动动的的的的人人人人称称称称和和和和数数数数要要要要与与与与先先先先行行行行词词词词保保保保持持持持一一一一致致致致；先先先先行行行行词词词词是是是是句句句句子子子子时时时时，从从从从句的谓语动词用第三人称单数形式。如：句的谓语动词用第三人称单数形式。如：句的谓语动词用第三人称单数形式。如：句的谓语动词用第三人称单数形式。如：I,I,who who amam your classmate your classmate,will share the work with,will share th

46、e work with you.you.28定语从句定语从句 He is one of the students He is one of the students who have made great who have made great progressprogress.2 2、“one one of of+复复复复数数数数名名名名词词词词”位位位位于于于于关关关关系系系系代代代代词词词词前前前前作作作作先先先先行行行行词词词词时时时时，从从从从句句句句的的的的动动动动词词词词通通通通常常常常要要要要用用用用复复复复数数数数；当当当当oneone前前前前有有有有the the(only

47、),(only),the the(very(very)等等等等修修修修饰饰饰饰时时时时，从从从从句句句句的的的的谓谓谓谓语语语语动动动动词词词词要要要要用用用用单单单单数数数数。如：。如：。如：。如：Mr Wang is the only one of my friends Mr Wang is the only one of my friends who has who has been invited to have dinner with usbeen invited to have dinner with us.29定语从句定语从句（九）（九）（九）（九）asas引导的定语从句引导的定

48、语从句引导的定语从句引导的定语从句 I wan to have such a dictionary I wan to have such a dictionary as he hasas he has.1 1、asas用用用用作作作作关关关关系系系系代代代代词词词词或或或或关关关关系系系系副副副副词词词词引引引引导导导导限限限限定定定定性性性性定定定定语语语语从从从从句句句句，并并并并在在在在从从从从句句句句作作作作主主主主语语语语、宾宾宾宾语语语语和和和和状状状状语语语语等等等等，构构构构成成成成“the the sameas”sameas”，“suchas”suchas”等结构。如：等结构

49、。如：等结构。如：等结构。如：I shall do it in the same way was I shall do it in the same way was as you didas you did.(as.(as作作作作状语状语状语状语)I like the same book I like the same book as you doas you do.30定语从句定语从句 The experiment is very important,The experiment is very important,as indeed it isas indeed it is .(as(as

50、代表整个句子，作表语代表整个句子，作表语代表整个句子，作表语代表整个句子，作表语)2 2、asas引引引引导导导导非非非非限限限限定定定定性性性性定定定定语语语语从从从从句句句句。asas在在在在定定定定语语语语从从从从句句句句中中中中作作作作主主主主语语语语、表表表表语语语语或或或或宾宾宾宾语语语语，这这这这个个个个定定定定语语语语从从从从句句句句说说说说明明明明整整整整个个个个句句句句子子子子，可可可可以放在主句之前。如：以放在主句之前。如：以放在主句之前。如：以放在主句之前。如：As is known to allAs is known to all,he is the best stu