中考英语语法专项之状语从句（原因条件让步）知识点及习题

状语从句2原因状语从句原因状语从句的概念：在复合句中，用于说明主句原因的句子。e.g.Thedoctorlookstiredandsleepybecausehesatupallnightwithpatients.e.g.Ineedtogotobednow,sinceIfeelexhausted.原因状语从句常见的连接词：1.because因为（重在原因）because引导的从句一般在主句后，

because表示直接原因，语气最强，最适合回答

why

引导的疑问句。Idoit

because

Ilikeit.Just

because

hedoesnotwanttoobeycommandsfromschool,hewantstodropout.Youarechosentoattendtheconference

because

youareexcellentinstudying.积累：because的同义短语becauseof：Wearelatebecauseofthebadtraffic.dueto：Hedidn’tgotothemeetingduetothestorm.thanksto：Theproblemhasbeensolvedthankstoyouradvice辨析：because和becauseof的区别1.短语because of 也表示原因，但它后面不接从句, 只能接名词, 代词或动名词。Hecan’tgotoschoolbecauseheisill.Hecan’tgotoschoolbecausehisillness.Theroadisclosed_________thesnow.Takeplentyofbreaks,__________theyofferadoublebonus.易错点：because 和so 不可同时出现在一个句子里。I do it because I like it. = I like it so I do it.We went by bus because it was cheaper.= It was cheaper so we went by bus.2.since由于；因为（重在结果）since引导的从句一般在主句之前，表示已知的、显然的理由，译为:“因为…，既然…，鉴于…””，语气比because弱。Since

youspenttoomuch,Iwilllimityourspending.Since the rain has stopped，let’s go forawalk.    Since we are young，we shouldn’t be too afraid of making mistakes.Since

(As)we’venomoney,wecan’tbuyit.3.as因为，既然（重在结果）as

引导从句表示附带说明的“双方已知的原因”，语气比since弱，位置较为灵活(多在主句前)。As

itisraining,you’dbettertakeataxi.As

youaretired,youhadbetterrest.Iwenttobedearly,

as

Iwasexhausted.Asitistoolate,lettaketheplaneinsteadofthetrain.4.for因为（表猜测的原因）for引导的从句并不说明主句行为发生的直接原因，只提供一些辅助性的补充说明或情况加以推断，for从句只能在主句后，并用逗号与主句隔开。Hecouldnothaveseenme,

for

Iwasnotthere.Hemustbeill,

for

heisabsenttoday.Hemustbeathomeyesterday,

for

itrainedheavily.Ithinkitismorningnow,

for

thebirdsaresinging.特殊的连接词：now(that)

鉴于某个事实,

既然inthat

鉴于某个事实,

既然seeing(that)

鉴于某个事实,

既然considering(that)鉴于某个事实,

既然given(that)鉴于某个事实,

既然这几个词汇与since,as意思相近，都表示“鉴于某个事实”“既然”。如：Now

(that)youaregrownup,youshouldnotrelyonyourparents.Hisrequestisunreasonable

inthat

heknowswecan'taffordit.Seeing (that) you’re already at the door, I suppose I must invite you inside.  Considering(that)he’s only sixteen year old, he is not fit for the job. Given (that) she is interested in children, I am sure teaching is the right career for her.【专项练习】Itaughtthemtosingmusiccanbringthemjoyandpeace.A.so B.although C.because D.and2.Hecouldn’tgetmoneyfromhisparents,heknewtheyhadnoextramoney.A.when B.so C.if D.because3.therightsidewasweak,theenemydecidedtoattackit.A.Though B.But C.Since D.While4.Jimisfullofwisdom__________healwaysknowstheanswertoeachquestion.A.becauseB.ifC.becauseofD.when5.Themeetingwasputofftheheavyrain.A.asB.sinceC.becauseD.becauseof6.Whywereyoulateforschool?Igotuplate.A.AsB.SinceC.BecauseD.Becauseof7.Istayeduplatelastnight,Iwastiredthismorning.A.Because;butB./；soC.Because;soD.Becauseof;so8.freshwaterisvaluable,itshouldn’tbewasted.A.Because;soB./；butC.Because;/D.Becauseof;so条件状语从句条件状语从句的概念：在复合句中，从句是表示条件的状语，叫做条件状语从句。条件状语从句可以放在句首或句尾。条件状语从句常见的连接词：1.if（如果）if可以引导真实条件句和非真实条件句，在引导真实条件句时，其引导的事件是可能真实发生的：Ifeveryoneobeysthetrafficrules,theroadswillbemuchsafer.在引导非真实条件句时，其引导的事件是与现实不同的，因此需要使用虚拟语气：If

Iwereyou,Iwouldsticktoit.2.unless=if...not...（除非）Wewillbelateunlesswehurry.=We

willbelateifwedonot

hurry.Theyfacecertaindeathunlesstheycanberescuedtoday.3.as/solongas（只要）Youcanstayhereaslongasyoukeeptheroomclean.Aslongasyou'rehappy,that'sallthatmatters.特殊的连接词：suppose/supposingthat:如果，假设provided/providingthat:如果，假设onlyif:只要onconditionthat:若是，以为条件Supposethatyouwinthelottery,whatwouldyoudowiththemoney?Youcanborrowmycar,providingthatyoureturnitbytomorrow.Youcangotothepartyonlyifyoufinishyourhomework.Iwillgoabroad

onconditionthat

myhusbandgoeswithme.条件状语从句的时态：Ifitrainstomorrow,Iwon'tclimbthehills.（主将从现）Wecanwinthebasketballgameifhejoinsus.（主情从现）Helpyourmomwiththehouseworkifyoufinishyourhomeworkearly.（主祈从现）条件状语从句与其他句式的转换：1.借助“祈使句+and/or+一般将来时的句子”这一句型来转换。and在句意上表示顺承关系,or表示转折关系。如:Ifyougetupearly,you'llgetthereontime.=Getupearly,andyou'llgetthereontime.=Getupearly,oryouwon'tgetthereontime.借助介词without或with来转换条件状语从句。如:Ifthereisnowater,fishwilldie.=Fishwilldiewithoutwater.Ifyouhelpme,I'llfinishtheworksoon.=Withyourhelp,I'llfinishtheworksoon.【专项练习】1.--Willyougotohaveapicnicwithus?--Iifitfine.A.willgo;is B.go;willbe C.willgo;willbe D.go;is2.Ifyouwater,itintosteam.A.willboil;willturn B.boil;willturn C.willboil;turns D.boil;turns 3.Inhotweather,foodgoesbadeasilyitiskeptinthefridge.A.unless B.if C.because D.since4.Youwillrememberthingswellyougetenoughsleepeverynight.A.if B.unless C.sothat D.where5.Theartclubisforstudentsonly.Youcan’tgoinyouhaveastudentcard.A.unless B.if C.because D.though让步状语从句让步状语从句的概念：在复合句中，从句表示“尽管、即使”的含义,主句的结果和从句表达的预期相反。让步状语从句常见的连接词：1.though，although（虽然，尽管）这两个连词意思大致相同，在一般情况下可以互换使用，在口语中though比较常用，although比较正式。【注意】都不能和but连用，但可以和yet,still或nevertheless连用，强调对比。Although/Though

ourteamtriedourbest,welostthegame.

Although/Thoughhewaswornout,hekeptonworking.Althoughsheisold,sheisstillhealthy2.evenif,eventhough（即使，纵使）evenif和eventhough带有较强的意味，语气比although和though强。Evenifhismotheragrees,hisfatherwon'tlethim

go.Eventhoughshewastired,shestayeduplatetofinishherhomework.

3.whether…or…（不管是…还是）Whetherhelikesitornot,hehastoattendthemeeting.

Whetheritrainsornot,wewillgoonthepicnictomorrow.

4.“nomatter+疑问词”，或“疑问词+ever”（无论）Nomatterwhereshegoes,shealwaysbringsherfavoritebookwithher.

Wherevershegoes,shealwaysbringsherfavoritebookwithher.特殊的连接词：as&though（构成倒装句）形容词+as/though+主语+谓语副词动词名词12-year-oldgirlassheis,shehashadagoodcommandofEnglish.她虽然只是个12岁的女孩，但是她已经熟知英语。MuchasIhavetraveled,Ihaveneverseenanyonewho'sascapableasJohn.我虽然去的地方多，但是我从来没见过像约翰这么能干的人。Successfulthoughheis,heisnotproud.他虽然非常成功，但并不骄傲。【专项练习】()1.cellphoneshelpusalotinourdailylife,theybringussomeproblems,too.A.Though B.However C.And D.But()2.Ihavegrownup,Iactlikeasmallchildsometimes.A.Although B.If C.Whether D.When()3.Idon’tknowhimwell__________I’veknownhimforalongtime.A.though B.so C.and D.or()4.__________difficultthetaskmaybe,wewilltryourbesttofinishit.A.NomatterB.nowonder C.though D.however()5.__________studyingabroadishard,itcanhelpyouunderstandtheworld.A.If B.Although C.Because D.When【综合练习】一、单项选择1.Althoughheisconsideredagreatwriter,__________.A.hisworksisnotwidelyread B.buthisworksarenotwidelyreadC.unlesshisworksarenotwidelyread D.yethisworksarenotwidelyread2.__________shewasverytired,__________shekeptworkingtillmidnight.A.If;/ B.However;/ C.Although;but D.Though;/3.__________youknowhowtowritethem,youcan'tusethemcorrectlyandexactly.A.Because B.Inorderthat C.If D.Eventhough4.Ifind__________difficulttotalktoforeignersinEnglish__________IthinkmyEnglishisquitegood.A.that;though B.this;although C.it;though D./;though5.—Look!Somepeoplearerunningtheredlights.—Weshouldwait_____othersarebreakingtherule.A.ifB.unlessC.althoughD.because6.______sheisyoung,sheknowsquitealot.A.WhenB.HoweverC.AlthoughD.Unless7.Ifyouafishoutofwater,it.A.take;willdie B.will;dies C.take;dies D.willtake;willdie8.youtellmethatyou’renotcoming,I’llseeyouatthepark.A.Though B.If C.Until D.Unless9.Iwonderifmysisterme.Ifsheme,Iouttoplay.A.visits;willvisit;willgo B.willvisit;visits;willnotgoC.willvisit;willvisit;willnotgo D.visits;visits;don’tgo10.youfeelhappy,I