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主谓一致主要有以下几种情况：1.and连接两个或两个以上单数名词或者代词作主语的时候,谓语动词有以下两种情况：(1)如果指两个或两个以上不同的人或事物的时候,谓语动词用复数。如：HeandIarebothstudentsofthisschool.我和他都是这个学校的学生。(2)但如果连接两个以上的名词指的是同一个人或物,或者指同一概念的时候,谓语要用单数。Thesingeranddancerisgoingtogiveusaperformance.那个歌唱家兼舞蹈演员要给我们表演。Theknifeandforkisonthetable.刀叉在桌子上。2.如果主语是不定式,动词ing形式或主语从句的时候,谓语动词用单数。Whatheisdoingseemsveryimportant.他正在做的事情看起来很重要。Collectingstampsishishobby.收集邮票是他的爱好。3.定语从句的关系代词who,which,that在从句中作主语时，要与先行词的人称和数保持一致。Thosewhoenjoysingingmayjoinus.Tom,whoisyourfriend,shouldhelpyou.4.with,alongwith,togetherwith,aswellas,besides,like,without,except,but,including如果句子中有这些连接词和主语连用,谓语动词的数随主语的变化而变化。例如：Theteacher,togetherwithhisstudents,isplantingtreesinthestreet.老师和他的学生们正在街道上植树。Mary,likemanygirls,lovesdancing.玛丽和其他女孩一样喜欢跳舞。Nooneexcept(but)meknowsaboutit.除了我没有人知道这件事情。Allthestudents,includingTom,areleaving.包括汤姆在内的所有学生都要走了。1.either...or;neither...nor;notonly...butalso,whether...or在句子中连接主语的时候或者在therebe句型中,谓语动词要和就近的主语保持一致。就近原则NeitheryounorIamwrong.Thereisacupofteaandsomeapplesonthetable.Notonlythestudentsbutalsotheteacherwishesforaholiday.概念一致原则所谓概念一致原则是指谓语动词和主语一致不是取决于主语的语法形式,而是其实际意义。有的主语名词在形式上是单数,但在意义上却是复数；有的主语名词在形式上是复数,但在意义上却是单数。1.不定代词all,more,some,any,none作主语,谓语动词视情况而定。Alloftheapplesarerotten.所有的苹果都烂了。Alloftheappleisrotten.整个苹果都烂了。Noneofthemoneyisleft.没有剩下一点钱。Noneofthestudentswerethere.没有学生在那里。2.therestof;halfof;partof;majorityof;percentof;onethirdof在句子中加名词作主语,谓语动词与of后面的名词保持一致。Halfofthestudentshavefinishedtheircomposition.一半的学生已经完成了他们的作文。Halfoftheappleisbad.一半的苹果坏了。About60percentofthestudentsinourschoolareboys.百分之六十的工作已经做完了.3.集合名词作主语,动词可用单数,也可以用复数。主要由句子的意思决定。强调整体谓语动词用单数；指全体人员时,动词则用复数。这一类常见的集合名词有public,family,class,crowd,population,team,group。Hisfamilyisbig.他们全家要外出。Hisfamilyareallmusiclovers.他们全家人都是音乐爱好者。4.某些名词如people,police等,形式是单数,意义是复数,谓语动词应用复数。people指“民族”时是例外。Thepolicearesearchingforathief.Thecattleareeatinggrassonthehill.5.下面的词作主语时,谓语动词要用单数，如someone,somebody,something,anybody,anyone,anything,everybody,everyone,everything,nobody,noone,nothing。Someoneisaskingforyou.有人找你。Nothingisfoundintheroom.在屋子里什么也没找到。6.名词如clothes,trousers,shoes,glasses等,通常只用其复数形式,但当它们被apairof修饰时,谓语动词用单数。Thepairofshoesiswornout.这双鞋破了。Theshoesarewornout.鞋子破了。7.某些名词以s结尾如maths,politics,physics,news,plastics等，谓语动词应用单数。Physicsisaveryinterestingsubject.8.every...andevery...;each...andeach...;no...andno...在以上短语中and连接的单数名词,整个短语在句中作主语时,谓语动词常使用单数。Eachmanandeachwomanisaskedtoattend.Everyboyandeverygirlintheclassisdiligent.Nosoundandnovoiceisheard.听不到任何声音。9.以anumberof作主语时,谓语动词用复数;以thenumberof作主语事,谓语动词用单数。Anumberofnewbooksareonthedesk.Thenumberofstudentsinyouclassis50.10.有些名词的单数和复数形式一样,作主语的时候,其谓语动词由上下文决定,这一类名词有:means,works,deer,fish,sheep,Chinese,Japanese等。Noteverymeansisuseful.不是每种方法都好使。Notallmeansareuseful.不是所有的方法都好使。11.manya,morethanone,oneandahalf与单数名词组成的短语,谓语用单数。Manyaboyhasseenit.许多孩子都看到了。12.书刊名、时间、距离、价格、度量衡等的复数名词作主语时,谓语动词常用单数。Thirtyyearsisnotalongtime.RootsisafamousAmericannovel.1.thiskindofbook=abookofthiskind(这种书),其谓语用单数;短语thiskindofmen=menofthiskind=thesekindofmen(口语)(这一类人),但thiskindofmen的谓语用单数,menofthiskind和thesekindofmen的谓语用复数allkindsof后跟复数名词,谓语用复数形式。Thiskindofmenisdangerous.Menofthiskindaredangerous.2.在主谓倒装的句子中,谓语动词的数应与其后的主语一致。Betweenthetwowindowshangsapicture.B)由连接词连接的名词作主语应该注意的几个问题:3.“分数或百分数+名词”构成的短语以及由“alotof,lotsof,plentyof,halfof+名词”构成的短语作主语时,其谓语动词要与短语中of后面的名词的数保持一致,这是因为短语中后面的名词是中心词,而短语中前面的量词是修饰语。例如:Lotsofdamagewascausedbyfire.Aboutthree-fourthsoftheearth’ssurfaceiscoveredwithwater.Three-fifthsoftheworkersherearewomen.和这种情况类似的还有“anumberof+名词复数”。但是,“thenumberof+名词”的中心词却是number。试比较：Anumberofstudentshavegonetothecountrysidetohelpwiththeautumnharvest.Thenumberofpagesinthisbookistwohundred.注意:A(large)quantityof修饰可数或不可数名词,其短语作主语时,谓语动词用单数。Alargequantityofpeopleisneededhere.(large)quantity,of修饰可数或不可数名词,其短语作主语时,谓语动词一般用复数。Quantitiesoffood(nuts)wereonthetable.短语inquantity,inlargequantities意为“大量”;insmallquantities意为“少量”。4.agreatdealof,alargeamountof,修饰不可数名词,其短语作主语时,谓语动词通常用单数;largeamountsof修饰不可数名词,其短语作主语时,谓语动词通常用复数。Alargeamountof(Agreatdealof)damagewasdoneinaveryshorttime.Largeamountsofmoneywerespentonthebridge.5.表示数量的oneandahalf后,名词要用复数形式,但是其短语作主语时,谓语动词用单数形式。例如：Oneandahalebananasisleftonthetable.6.如果主语由“the+形容词(或过去分词)”结构担任时,谓语通常用复数;这类词有:thebrave,thepoor,therich,theblind,theyoung,theold,thesick,thedead,thedeafanddub,theoppressed,theinjured,thewounded,theunemployed等;但也有少数的过去分词与定冠词连用时指个别,则用单数。例如：Theblindstudyinspecialschool.Thedeparted(死者)wasawell-knownengineer.这类形容词或分词如果要表示个体时,就要与名词man,person或表示人的单数连用。例如:anoldman,arichperson,the(a)woundedsoldier.