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考点24状语从句状语从句是历年各省市中考必考知识点从考查形式看,一般有单项选择、完形填空、词语运用等所占分值通常为2〜4分从命题意图看,侧重考查考生的具体语言环境中使用连词的能力主句+that+肯定句让步Oalthoughthougheventhough/if比较othan口的Osothatinorder、方式Oasinorderthat与inorderto只是结构相似,含义相同,但两者用法却有较大差异,不能够互换使用,因为后者不能引导目的状语从句,只能跟动词原形构成目的状语
三、条件状语从句条件状语从句,即在某种条件下,一件事情可能发生在英语中由连接词if或unless等引导的状语从句叫作条件状语从句条件是指某一件事情实现之后(状语从句中),一件事情(主句)才能发生,通常译作”假如,只要,如果”等意思条件状语从句中,主从句的时态要遵循“主将从现”的原则即,主句是将来时态时,从句用一般现在时代替将来时o引导条件状语从句的连词或词组有if(如果)unless(除非),aslongas(只要)等如果主句是将来时,条件状语从句也用一般现在时来表示如Iwillstayathomeifitrainstomorrow.如果明天下雨,我就待在家YoucantlearnEnglishwellunlessyouworkhard.除非你努力学习,否则是学不好英语的l.if引导的条件状语从句表示在某种条件下某事很可能发生IfwepaymuchattentiontotheearthweHhaveabetterworld.如果我们多关爱地球,就会拥有一个更美好的世界Ifitrainstomorrowwhatshallwedo如果明天下雨,我们怎么办?Ifyouaskhimhewillhelpyou.如果你请他帮忙,他会帮你的Ifyoufailintheexamyouwilllethimdown.如果你考试不及格,你会让他失望的注意if还可以引导虚拟条件句,表示不可实现的条件,从句中多用一般过去时或过去完成时Whatwouldhappeniftherewerenowater如果没有水会怎样?unless的意思是”如果不,除非o可与if...not互换YouwillfailinEnglishunlessyouworkhard.你英语考试会不及格的,除非你更加努力Youwillfailtoarrivethereintimeunlessyoustartearlier.如果你不早点动身,你就不能及时赶到那儿Unlessitrainsthegamewillbeplayed.除非下雨,比赛将照常进行as/solongas引导的条件状语从句as/solongas的意思是只要SolongasyourehappyIwillbehappy.只要你高兴,我就高兴Youmayborrowmybookaslongasyoukeepitclean.只要你保持书的清洁,你就可以把我的书借去once引导的条件状语从句once引导的条件状语从句,意为“一旦……就,从句可置于主句前或后Onceyoubeginneverstop.一旦开始,就绝不要停止Mathsiseasytolearnonceyouunderstandtherules.一旦你理解了规则,数学就不难学了提示在条件状语从句中,用一般现在时代替一般将来时,用一般过去时代替过去将来时Iftheweatherisbadnextweekwellputofftheclimbing.如果下周天气不好,我们将推迟爬山FathertoldmeifIworkedhardhewouldbuymeagift.爸爸告诉我,如果我努力学习,他会给我买一份礼物引导条件状语从句最常用的连词是if常见的if条件状语从句表示在某条件下,某事很可能发生,条件是可能存在的,主句中某种情况发生的概率也是很高的如:Ifyouaskhimhewillhelpyou.如果你请他帮忙,他会帮你的Ifyoufailintheexamyouwilllethimdown.如果你考试不及格,你会让他失望的Ifyouhavefinishedthehomeworkyoucangohome.如果你作业做完了就可以回家了另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设从句多用一般过去时或过去完成时,表示对现在或过去的一种假设如IfIwereyouIwouldinvitehimtotheparty.如果我是你,我会邀请他参加聚会IwouldhavearrivedmuchearlierifIhadnotbeencaughtinthetraffic.要不是交通堵塞,我本会来得早一些if条件句的时态搭配if从句用一般现在时,主句用一般将来时Ifherunshellgetthereintime.如果他用跑的,他就会及时赶到那儿Thecatwillscratchyouifyoupullhertail.如果你拉猫的尾巴,它就会抓你if从句用一般现在时,主句用may/might/canIfthefoggetsthickertheplanemay/mightbediverted.如果雾再大一些,飞机可能就会改在别的机场降落Ifitstopssnowingwecangoout.如果雪停了,我们就可以出去if从句用一般现在时,主句用must/shouldIfyouwanttoloseweightyoumust/shouldeatlessbread.如果你想减肥,你必须少吃面包if从句用一般现在时,主句用一般现在时Ifyouheaticeitturnstowater.(也可用willturn)如果把冰加热,它就会化成水if从句用现在进行时,主句用一般将来时IfyouarelookingforPeteryoullfindhimupstairs.如果你是在找彼得,上楼就会找到他if从句用现在完成时,主句用一般将来时IfyouhavefinisheddinnerIllaskthewaiterforthebill.如果你吃完了,我就叫服务生来算账【知识拓展】
1.在以whenbeforeassoonas等引导的时间状语从句也适用“主将从现“原则即如果主句是一般将来时,从句则用一般现在时Filtellherthegoodnewswhenshecomesback.当她回来的时候,我将把这个好消息告诉她shewillgiveyouacallassoonasshereturns.她一回来就会给你电话
2.1f条件句的同义句祈使句,and/or+将来时态的陈述句Workhardandyouwillmakegreatprogress.=Ifyouworkhardyouwillmakegreatprogress.如果你努力学习,你就会取得大的进步Hurryuporyouwillbelate.=Ifyoudonthurryupyouwillbelate.如果你不快点,你就要迟到了【巧学妙记】nifn引导的条件状语从句的记忆口诀if条件句不一般,几个要点记心间;条件句,放在前,逗号要放句中间条件句表真实,主将从现要遵从;条件句非真实,虚拟语气用到位在跟踪训练Hegotupearlythismorninghecouldcatchthefirstbus.A.sothatB.inordertoC.untilD.assoonashehaslittleknowledgetheoldworkerhasalotofexperience.A.AlthoughB.BecauseC.IfD.While.一Whenwillshegohome—Shehomeuntilshefinishesherwork.A.wontgoB.didntgoC.willgoD.went——Letsgoswimmingifitthisweekend.—Butnobodyknowsifit.willbefine;willrainB.isfine;willrainC.isfine;rainsD.willbefine;rains——Hurryup!Weregoingtomissourflight.-wearriveattheairportnowwehaventenoughtimetocatchtheflight.A.EvenifB.IfC.UnlessJackisthirstyforknowledgealltheteacherstakehimasourexample.Weoftendonthavedinnermyparentscomebackhomefromworkeveryevening.A.untilB.whileC.afterItssnowingsohardoutside.Youdbetternotleaveitstops.A.whenB.untilC.sinceD.whileTherearefewerandfewerligersintheworld.Thesituationwillcontinuehumansstopkillingthemforfurandbones.A.ifB.sinceC.unlessD.becausethinkourmiddleschoollifeiscolourfulandmeaningfulIamalwaysbusywithschoolwork.A.becauseB.unlessC.thoughUnlesswebookitnowthereanyticketsleftfortheconcert.A.arentB.werentC.haven91beenD.wontbeZhangGuimeiisinpoorhealthshestilltriesherbesttohelpgirlsfrompoorareas.A.UnlessB.BecauseC.UntilD.ThoughTheoldladydonatedlotsofmoneytothepoorpeopleshelivedasimplelifeherself.A.unlessB.untilC.ifD.though一HowisMarygettingonwithherschoolwork—Itshardtosay.Shewillfailthehighschoolentranceexamshekeepsstudyinghard.A.afterB.untilC.whenD.unlesswehavemadethepromiseletskeeptoitandnotgiveupeasily.(2022•西藏•中考真题)Chinesesoldiersoftenhelppeopleintroubletheyknowitisdangerous.A.soB.althoughC.butD.because(2022•西藏•中考真题)GuAilingworkedhardshegotexcellentachievementsattheBeijing2022WinterOlympicGames.A・notonly...butalsoB.such...thatC.not...untilD.so...that(2022•广西桂林•中考真题)Ifyoualongthisroadyouwillfindapark.A.goB.wentC.goes(2022♦山东东营•中考真题)Youwontbeallowedtoentertheschoolyourtemperatureishigherthannormal.A.ifB.untilC.thoughD.unless(2022•江苏淮安•中考真题)Wewouldliketobuyelectriccarstheyproducelessairpollution.A.becauseB.soC.thoughD.but(2022•上海•中考真题)Youwonthaveabetterviewofthevillageyoureachthetopofthehill.A.becauseB.unlessC.whenD.if(2022•山东青岛•中考真题)AsapolicemanTomsfatheristoobusytoplaywithhimheexpectsto.A.eventhoughB.sothatC.assoonasD.aslongas(2022•江苏盐城•中考真题)WellhaveapicnicintheparkthisSundaythereisaheavyrain.A.whetherB.unlessC.sinceD.because(2022•江苏南通・中考真题)Maryisgoodatwriting.Iamsureshellgetagoodplaceshetakespartinthewritingcompetition.A.beforeB.ifC.thoughD.unless(2022•贵州黔西•中考真题)Youwontpasstheexamyouworkharderthanbefore.(2022•湖南株洲•中考真题)Hedidntgotobedhefinishedhisworklastnight.A.becauseB.ifC.until(2022•辽宁沈B日•中考真题)Ilovegoingtoschooleveryoneinmyclassisfriendly.A.beforeB.althoughC.becauseD.unless(2022・湖南邵阳•中考真题)一Mikewhyareyoureadingoutside一Icannotenterthelibraryitopens.A.becauseB.ifC.until(2022•黑龙江齐齐哈尔•中考真题)Learningtowriteislearningtothink.youwontknowthingsclearly.A.ifyouwritethemdownB・unlessyouwritethemdownC・ifyouwontwritethemdown(2022•广西贺州•中考真题)IwontgotothemoviesthisafternoonImfree.A.orB.unlessC.becauseD.than.(2022•江苏无锡•中考真题)Youwillnotgetthespecialgiftyoufinishallthetasks.A.afterB.becauseC.whileD.unless(2022•江苏泰州•中考真题)一Itisimpossibletofinishthedifficulttaskinsuchashorttimeonmyownbothofusworktogether.一Noproblem.Letsstart!A.ifB.butC.becauseD.unless(2022•江苏扬州•中考真题)astronautsgoonspacewalkstheywearspacesuitstokeepthemselvessafe.A.ThoughB.TillC.WhenD.Unless(2022•湖南怀化•中考真题)1wanttobuysomethingspecialformygrandmotherherbirthdayiscoming.A.becauseB.althoughC.so(2022・四川自贡•中考真题)一ThismathexerciseisdifficultIcantworkitout.——Comeon!Useyourheadandyouwillfindaway.A.such;thatB.so;whichC.so;that在模拟检测(2022・7可1匕・石家庄市第二十,l中学二模)Wecanachievesuccesswedontgiveuptrying.A.eventhoughB.aslongasC.asifD.assoonas(2022♦江苏•无锡外国语学校二模)一Whydidhelooksosad一Hisfriendtoldhimthatitwouldbequitealongtimetheyhadachancetogettogetheragain.A.afterB.beforeC.sinceD.when(2022•江苏•连云港外国语学校二模)Thestudentsinourschooltoentertheschooliftheirtemperatureisabove
37.3℃.A.don9tallowB.won9tallowC.arentallowD.wontbeallowed(2022•江苏・常州市武进区星辰实验学校二模)一Itssokindofyoutogotovisityourgrandparentseveryweekend.一IusuallytalktothemtomakethemhappyImverybusy.A.unlessB.becauseC.untilD.if(2022・江苏•盐城市盐都区实验初中一模)Friendshavealotincommontherearesomedifferences.A.untilB.sinceC.althoughD.after(2022・辽宁•铁岭县莲花第一初级中学一模)Icanputtimetogoodusedadalwaysremindsmetovaluethetime.A.soB.andC.thoughD.since(2022・江苏•沛县教师发展中心模拟预测)TheCOVID-19isstillspreadingrapidly.WeUlbeattheriskofcatchingtheviruswegetavaccine(疫苗).A.ifB.unlessC.whenD.whether(2022•江苏镇江•模拟预测)Themuseumwillsoonbeopentothepublicthecheckingworkisdone.A.butB.ifC.whileD.unless(2022•江苏宿迁•三模)WehaveameetingeveryMondaymorningthereisnothingtodiscuss.A.asB.unlessC.sinceD.when(2022・江苏无锡•模拟预测)Lifeislikeaone-wayracesotreasureeverymomenttimecannotbewonagain.A.soB.asC.ifD.unless(2022•江苏南通•模拟预测)DanielwillsucceedinworkingouttheMathsproblemhegivesup.A.untilB.unlessC.becauseD.though(2022♦内蒙古兴安盟•二模)一Ithinktheenvironmentisterribletheseyears.一Yesitwillbeevenworsethegovernmenttakesactiontoprotectit.A.thoughB.whenC.ifD.unless(2022•江苏苏州市金阊实验中学校一模)Nocountryissafeallcountriesaresafe.A.sinceB.althoughC.whileD.unless(2022•江苏宿迁•三模)Itsapitythatsmokerswontrealizetheimportanceofhealththeyloseit.
1.引导时间状语从句的连词(2022•江苏•射阳县第三中学一模)Mybrotherisgoingtolookforanotherjobthebossoffershimmoremoney.A.afterB.whenC.unlessD.if(2022•江苏南京•二模)一Wewillgooutforapicnicitrainstomorrow.一Youneedntworryabouttheweather.Itssunnytomorrow.A.untilB.ifC.unlessD.when(2022•江苏省锡山高级中学实验学校三模)Loveyourparentstheyarealive.Neverwaituntilitistoolate.A.thoughB.becauseC.whileD.until(2022•山东•无棣县教育科学研究中心二模)一ClaudiaareyougoingtoJeffsbirthdaypartyonSaturday—UnlessI.A.invitedB.willbeinvitedC.wasinvitingD.aminvited(2022・江苏・射阳县第四中学一模)一IsourWechataccountsafe一Yesnobodycanuseittheyhavethepassword.A.unlessB.whenC.sinceD.if(2022•山东・阳信县教育科学研究中心一模)Thegirldidntacceptthegifttheyoungmantoldherthereason.A.unlessB.untilC.whenD.although(2022・山东•阳信县教育科学研究中心一模)一Dontworryaboutthefinalexam.Youitifyouworkhard.-Thanks!A.passB.willpassC.passedD.havepassed(2022•湖北荆州•模拟预测)——Ithasbeenmucheasierformetogotoworksharedbikesappeared.—Buttheyalsocausedplentyofproblems.(2022・)胡南林叼卜|・三模)IwillgivethebooktoTomassoonasIhim.A.seeB.sawC.willsee(2022•湖南郴州•三模)一Icantgetonwellwithmyfamily.一WhynottalkwiththemYoushouldcommunicatethingsbecomeworse.A.untilB.unlessC.before(2022•湖北省直辖县级单位•模拟预测)PresidentXiencouragesallChinesepeopletoplanttreesourcountrycanbegreenerandmorebeautiful.A.sothatB.assoonasC.eventhoughD.eversince篮球吧“知乐感i时间状语从句的时态问题在时间状语从句和条件状语从句中,主句如果使用一般将来时态,从句使用一般现在时表示将来,即所谓的”主将从现AssoonasIarriveinBeijingIwillringyouup.我一到北京就给你打电话Youllfallbehindtheothersunlessyoustudyhard.如果你不努力学习,你将会落后于其他人whenwhileas引导时间状语从句的区别whenwhileas显然都可以引导时间状语从句,但用法区别非常大
①when可以和延续性动词连用,也可以和短暂性动词连用;而while和as只能和延续性动词连用Whydoyouwantanewjobwhenyouvegotsuchagoodonealready你已经找到如此好的工作,为何还想再找新的?(get为短暂性动词)SorryIwasoutwhenyoucalledme.对不起,你打电话时我刚好外出了(call为短暂性动词)Strikewhiletheironishot.趁热打铁(is为延续性动词,表示一种持续的状态)Thestudentstooknotesastheylistened.学生们边听课边做笔记(listen为延续性动词)
②when从句的谓语动词可以在主句谓语动作之前、之后或同时发生;while和as从句的谓语动作必须是和主句谓语动作同时发生a.从句动作在主句动作前发生,只用whenoWhenhehadfinishedhishomeworkhetookashortrest.(finished先发生)当他完成作业后,他休息了一会儿WhenIgottotheairporttheguestshadleft.(gotto后发生)当我赶到飞机场时,客人们已经离开了b.从句动作和主句动作同时发生,且从句动作为延续性动词时,whenwhileas都可使用
①When/While/Asweweredancingastrangercamein.(dance为延续性动词)当我们跳舞时,一位陌生人走了进来
②When/While/AsshewasmakingaphonecallIwaswritingaletter.(make为延续性动词)当她在打电话时,我正在写信c.当主句、从句动作同时进行,从句动作的时间概念淡化,而主要表示主句动作发生的背景或条件时,只能用aso这时,as常表示随着……”一边……,一边……”之意Asthetimewentontheweathergotworse.随着时间的过去,天气变得更糟糕了Theatmospheregetsthinnerandthinnerastheheightincreases.随着高度的增加,大气越来越稀薄AsyearsgobyChinaisgettingstrongerandricher.随着时间一年一年过去,中国变得越来越富强了Thelittlegirlssangastheywent.小姑娘们一边走,一边唱Thesadmothersatontheroadsideshoutingasshewascrying.伤心的妈妈坐在路边,边哭边叫d.在将来时的从句中,常用when且从句要用一般时代替将来时YoushallborrowthebookwhenIhavefinishedreadingit.在我读完这本书后,你可以借阅WhenthemanagercomeshereforavisitnextweekIlltalkwithhimaboutthis.下周,经理来这参观时,我会和他谈谈此事
③when用于表示就”的句型中指过去的事情sb.hadhardly=scarcelydonesth.when...=Hardly/Scarcelyhadsb.donesth.when...Ihadhardly/scarcelyclosedmyeyeswhensomeoneknockedatthedoor.=Hardly/ScarcelyhadIclosedmyeyeswhensomeoneknockedatthedoor.我刚一闭上眼,就有人在敲门了Ihadhardly/scarcelyenteredmyroomwhenthetelephonerang.=Hardly/ScarcelyhadIenteredmyroomwhenthetelephonerang.我刚一走进房门,电话就响了
3.比较until和till此两个连词意义相同肯定形式表示的意思是“做某事直至某时「动词必须是延续性的否定形式表达的意思是直至某时才做某事”动词为延续性或非延续性都可以正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式肯定句Isleptuntilmidnight.我一直睡到半夜时醒了WaittillIcallyou.等着我叫你在肯定句中可用before代替例如Letsgetinthewheatbeforethesunsets.否定句Shedidntarriveuntil6oclock.她直到6点才到Dontgetoffthebusuntilithasstopped.公共汽车停稳后再下车Ididntmanagetodoituntilyouhadexplainedhow.直至尔教我后我才会做区别until可用于句首,而till通常不用于句首UntilyoutoldmeIhadheardnothingofwhathappened.直到你告诉我以前,出了什么事我一点也不知道untilwhen疑问句中,until要放在句首一Untilwhenareyoustaying一UntilnextMonday.注意否定句可用另外两种句式表示Notuntil…在句首主句用倒装Notuntiltheearlyyearsofthe19thcenturydidmanknowwhatheatis.直到19世纪初,人类才知道热为何物NotuntilIbegantoworkdidIrealizehowmuchtimeIhadwasted.直到工作,才认识到我已蹉花了许多岁月Itisnotuntil...that...ItwasnotuntilIbegantoworkthatIrealizedhowmuchtimeIhadwasted.5表示一……就……”的结构hardly/scarcely...when/beforenosooner...than和assoonas都可以表示“就”的意思Ihadhardly/scarcelygothomewhenitbegantorain.刚回家,就下起雨来了Ihadnosoonergothomethanitbegantorain.AssoonasIgothomeitbegantorain.注意如果hardlyscarcely或nosooner置于句首,句子必须用倒装结构Hardly/ScarcelyhadIgothomewhenitbegantorain.NosoonerhadIgothomethanitbegantorain.
二、目的状语从句英语里可以用t,inordertosoastosothatinorderthat来表示目的toinordertosoasto引导目的状语短语,构成简单句Hehastoearnlotsofmoneyinorderto/to/soastoraisehisfamily.他赚很多钱是为了养家糊口sothatinorderthat引导目的状语从句,构成复合句,并且从句中谓语动词常与cancouldmaymight等情态动词连用Speakclearlysothat/inordertoeverybodycanunderstandyou.请说清楚一点,这样每个人都能听得懂r目的状语从句such...that…‘°由抵|So...that...卜结果状语从句L结果状语从句Jsothatsothat既可以引导目的状语从句又可以引导结果状语从句引导目的状语从句时译为为了,引导结果状语从句时可译为以便Heworkedhardathislessonssothathecouldgainhighgradesintheexams.他努力学习功课,争取考试能获得好的成绩Heworkedhardathislessonssothathegainedhighgradesintheexams.他努力学习,结果考试取得了好成绩sothat引导目的状语从句时表示以便,为了,从句中常使用cancouldmaymightwillwouldshould等情态动词或助动词;引导结果状语从句时,从句中一般不用can和may等词Hehastoearnsolotsofmoneysothathecanbuyhischildrennicefoodandclothes.他必须赚很多钱才能给他的孩子提供好的饮食和衣服such...that...在such…that…句型中,such修饰名词,意思是”如此以至于,such...that...引导四种不同的句子结构such+an+形容词+单数名词+that从句Thisissuchagoodbookthatallofuslikeitverymuch.这是一本很好的书,我们大家都喜欢读它such+形容词+复数名词+that从句Theyaresuchgoodstudentsthattheteacherlikesthem.他们都是很好的学生,老师喜欢他们such+形容词+不可数名词+that从句Itwassuchfineweatheryesterdaythatwewentswimming.昨天天气很好,我们去游泳了onenoanyalLmanysomeseveral等+such+可数名词+that从句TherearemanysuchgoodbooksthatIcantdecidewhichonetochoose.有这么多的好书,我无法决定选择哪一本so...that...so...that…句型中的so是副词,常用来修饰形容词或副词,意思是”如此/这么……以至于……”常用句型主语+谓语+so+M/./“db+that从句TheboyransofastthatIcouldntcatchhim.这个男孩跑得太快了以至于我追不上他so+形容词+an+单数名词+that从句Shemadesogoodamealthatweallatefartoomuch.她做的饭菜那么好吃,结果我们都吃得太多了so+many/muchfew/little少+名词+that从句当名词前有many、muchfewlittle少等词修饰时,句子中要用so...that…而不能用such...that...oTherewassolittlewaterinthejarthatitwasnotenoughforallofus.缸里的水太少了,不够我们这些人用注意:当little的意思是“小时仍用such...that...o.用inorderthat引导inorderthat的意思是“为了”Heisworkinghardinordertopasstheexamination.=Heisworkinghardinorderthathecanpasstheexamination..用incase引导incase此时的意思是以防以备”Ialwayskeepabottleofwinebyincasefriendscallround.我平时总存着一瓶酒以备朋友来时喝注意incase引导目的状语从句与引导条件状语从句时的意思不一样.在目的状语从句中也有这样一个引导词——inorderthat容易与它混淆的词组是inorderto后者并不能引导状语从句下面看一下两者有哪些具体差别首先要注意的是,inorderthat与inorderto译文相同,都译作”为了”,不同之处在于inorderthat+从句;inorderto+动词原形inorderthat+从句构成目的状语从句,表明主句行为目的;inorderto+动词原形构成目的状语,不成从句IgetupearlyinorderthatIcancatchtheearlybus.Igetupearlyinordertocatchtheearlybus.为了能赶上早班车,我很早就起床了Heworkshardinorderthathecanobtainahigherposition.Heworkshardinordertoobtainahigherposition.为了升职,他很努力地工作另外,目的状语从句还有一个特点由于目的都是未来的行为,所以从句中一般用表示未来可能性时态,当然还可以用willwouldcan等HestudiesEnglishveryhardinorderthathewillgoabroadoneday.为了将来有一天能够出国,他很努力地学习英语从属连词用法例句While”与……同时,在……期间“,从句常用延续性动词或表示状态的词Don^talkloudwhileasothersareworking.别人工作时一,请勿大声说话When”当……时”,表示主句的动作和从句的动作同时或先后发生,从句的动词可用延续性动词,也可用非延续性动词Itwasrainingwhenwearrived.我们到达时,天正下着雨whenyoureadthepoemasecondtimethemeaningwillbecomeclearertoyou.当你再读一遍这首诗,你就会更清楚它的含义As”正当,一边……一边,随着『表示两个动作同时发生或某事发生时,另一个动作发生了Astimewentonhistheoryprovedtobecorrect.随着时间的推移,他的理论被证明是正确的Till/Until用于肯定句时,表示“直到……为止”,主句必须为延续性动词;not...until/till表示直到……才”,主句常用短暂性动词Weshallwaituntil/tillhecomesback.我们将一直等到他回来Ididntleaveuntil/tillshefinishedherhomework.直到她完成作业我才离开Since”自……以来”,主句用一般现在时或现在完成时,从句用一般过去时IhaveheardlotofgoodthingsaboutyousinceIcomebackfromabroad.自从我从国外回来,我已经听许多好的事情Before在……以前Hemustfinishalltheworkbeforehegoeshome.回家之前他必须完成所有的工作After在……之后Letsplayfootballafterschool.放学后我们打。