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一、时间状语从句when/wheneverwhileas引导的时间状从eg.Whilesomepeoplearemotivatedbyaneedforsuccessothersaremotivatedbyafearoffailure.Astheaverageageofthepopulationincreasestherearemoreandmoreoldpeopletocarefor.WeIIanswerhercallwheneverourmotherlandneedsus.when:从句谓语可以是非延续性动词或非延续性动词从句的动作和主句的动作可以同时发生,也可以先后发生while:从句的谓语动词为延续性动词从句的动作与主句的动作同时发生as:从句谓语一般为延续性动词从句的动作与主句的动作同时发生或交替进行可译为“一边…,一边…;随着…”固定句型重点IwaswatchingTVlastnightwhenLilyknockedatthedoor.IwasabouttogoonthepointofgoingoutforawalkwhenLilypaidavisittome.Ihadjustfallenasleepwhenthetelephoneran.总结正在做…突然…正要做…突然…刚做完…突然…Itis/hasbeen3yearssincehebegantosmoke.非延续性动词,他抽烟3年了;做…多久了Itis/hasbeen3yearssincehesmoked.延续性动词,他不抽烟3年了;不做…多久了before的特殊用法Itwillbe+一段时间+before…还要…才Itwas+一段时间+before…过了…才…Itwon1tbe/wasnt+一段时按+before…没过多久就…Ifyoumissthischanceitmaybeyeasbeforeyougetanotherchance.翻?译Itwon*tbelongbeforewegraduate.翻译:until可以和not连用,till一般不行5注意hardly…when…;nosooner…than…结构中,主句用过去完成时,than或when所在的从句用一盛过去时,且当hardly和nosooner放于句首时,要引起部分倒装HardlyNosoonerhadIgottothestationwhenthanthetrainleft.我一到火车站,火车就离开了^everytimeeachtimenexttimethefirsttimebythetime等引导的时间状语从句Everytime/Eachtime/NexttimehegoestoBeijinghewillvisittheSummerPalace.注意1thefirsttime和thefirsttime的区别thefirsttime弓I导时间状语从句ThefirsttimeIcametoBeijing.Ifellinlovewiththecity.thefirsttime作时间状语,不能弓I导从句ThisyearIcametoBeijingforthefirsttime.bythetime要和对应的完成时连用BynowIhavebeentoBeijingtwice.Bytheendoflasttermtheyhadmadegreatprogress.By2050theywillhavewastedmillionsofdollars.
二、让步状语从句althoughthoughas和while引导的让步状语从句Althoughthesemeasurearenoteffectiveforevertheyarevitalfornow.Hotas/thoughthenightairwaswesleptdeeplybecauseweweresotiredafterthelongjourney.注意1although/while引导的从句不倒装,while只能置于句首;2though引导的从句可以倒装,也可以不倒装,且though可以做副词,意为“然而”,表转折,置于句末;as引导的从句必须倒装Childasheisheknowsalot.Tryasyoumayyouwon*tmakeit.Changeyourmindasyoumayyouwon1tsucceed.BusyasheisheoftenhelpsmewithmyEnglish.Hardashestudiedhefailedagain.总结as弓I导的让步状语从句要把提前,且当表语是可数名词单数,前置时要省略evenif/eventhough引导让步状语从句表示语气更强的让步,意为“即使,即便”Timisingoodshapephysicallyevenif/thoughhedoesn1tgetmuchexercise.“疑问词+・ever”引导让步状从whateverwhoeverwhomeverwheneverwhereverwhicheverhowever弓I导让步状语从句表示“无论…”;引导让步状语从句时相当于nomatterwhatwhowhomwhenwherewhichhowItisgenerallyconsideredunwisetogiveachildwhateverheorshewants./nomatterwhatheorshewants.However/Nomatterhowhardyoutryitisdifficulttoloseweightcuttingdowntheamountyoueat.注意whateverwhoeverwhomeverwhichever还可以引导名词性从句,但是nomatter结构不可以Whoevergetsthemostpointswillbethewinner.这句话的whoever弓|导且不能改为nomatterwhowhether・・・or…意为无论…还是…”,提供两种对比情况Allpeoplewhethertheyareoldoryoungrichorpoorhavebeentryingtheirbesttohelpthoseinneedsincethedisaster.
三、条件状语从句.由ifunlesssoaslongas等连接IfhecomesIshallaskhimsomequestions.We*IIgotovisittheGreatWallunlessitrainstomorrow.unless=Youmayusethedictionaryso/aslongasyoukeepitclean注意条件状语从句中,基本时态原则为.supposesupposingincaseonconditionthatprovidedproviding可弓[导条件状语从句Suppose/Supposing/Providing/Providedthat=lfthere1snoelectricitywhatshallwedoIncasesomeonecomestoseemeaskhim/herleaveamessage.<万——,彳设如〉Youmaygoswimmingontheconditionthatyoufinishyourhomeworkv在…条件下〉
四、辨析三大从句状语从句和主句通常用逗号隔开,且从句中不缺主要成分,主要根据句意判断所填弓I导词;名词性从句通常跟主句是嵌入式关系,需要先找到主语谓语动词再进行判断从句类型,再根据从句所缺成分和句意选择弓I导词;定语从句通常紧跟在名词之后,较好判断,选用弓I导词时主要看先行词种类和从句所缺成分来进行判断易混点1定语从句和并列句Shehasmanynovelssomeofareinteresting.Shehasmanynovelsandsomeofareinteresting.易混点2:定语从句和状语从句Weyoungpeopleshouldgototheplaceisneedofhelp.Weyoungpeopleshouldgoweremostneeded.定语从句和状语从句的主要区别定语从句先行词为表示地点的名词,而地点状语从句没有;定语从句修饰的是先行词,地点状语从句修饰的是谓语动词易混点3as引导限制性定语从句和结果状语从句的区别Thisissuchaninterestingworkofartallofuslike.Thisissuchaninterestingworkofartallofuslikeit.thesams---as;so/such---as引导的定语从句中as在从句中充当一定的成分;such/so…that弓I导结果状语从句,that不在从句中做成分易混点4定语从句和名词性从句
1.1isknowntoeverybodythemoontravelsroundtheearthonceeverymonth.2isknowntoeverybodythatthemoontravelsroundtheearthonceeverymonth.3isknowntoeverybodyisthatmoontravelsroundtheearthonceeverymonth.
2.1hashelpedtosavethedrowninggirlisworthpraising.2Anyonehashelpedtosavethedrowninggirlisworthpraising.定语从句与主语从句的区别定语从句是形容词性从句,其作用相当于一个形容词,在整个句子中作定语,用来修饰前面的名词或代词;而主语从句,其作用相当于一个名词,在整个句子中作主语1Themothermadeapromisepleasedallherchildren.2Themothermadeapromiseshewouldbuynewtoys.定语从句与同位语从句的区别定语从句是形容词性从句,其作用相当于一个形容词,用来修饰前面的名词或代词;同位语从句是名词性从句,其作用相当于一个名词,对前面的名词作进一步解释,同位语从句一般与抽象名词同位定语从句的that在从句中充当主语、宾语、表语,做宾语时可以省略;而同位语从句的引导词that在从句中只起连接作用,不作任何句子成分,且不能省略1Myuncleistheownerofarestaurantclosetotheplaceisthecenterofthetown.MyuncleistheownerofarestaurantclosetoIlive.1Ourteacherdidallhecouldtohelpus.Ourteacherdidhecouldtohelpus.1Iwillhelpthoseareinneedofhelp.21willhelpisinneedofhelp.1Shewasnotsheusedtobe.2Shewasnotthewomansheusedtobe.。