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八年级上知识点总结Unit3Whatwereyoudoingwhentherainstormcame?本单元语法归纳：过去进行时：1.概念:表示过去某一时刻或某段时间内正进行的动作。2.构成:was/were+动词现在分词3.用法:a:表示某一时刻正进行的行为,与特定的过去时间状语连用,常见的时间有:at8lastnight,atthistimeatthattime,atthatmoment等e.g.Whatwereyoudoingat10yesterdaymorning?Iwaswritingalettertomyfatheratthatmoment.b:表示过去某段时间内正进行的动作。e.g.Wewerebuildingahouselastwinter.Theywerewaitingforyouyesterday.否定句和疑问句：e.g.Wewerenotsleepingathome.Washefeelingwell?4.现在分词的构成1)一般动词在词尾加-ing,如go--going。2)以不发音字母e结尾的动词,先去掉e,再加-ing。come--comingmake--makingwrite--writing3)以重读闭音节结尾的动词,如果末尾以一个辅音字母结尾,应先双写这个字母,再加ing，x和w结尾的除外。如:get--gettingswim--swimmingshow--showing4)以字母y结尾的单词,直接加ing。如carrying、playing、studying。5)以字母ie结尾的动词,变ie为y,再加ing。die→dyinglie→lying6)以元音字母加e结尾,或以e结尾,且e发音的动词,直接加-ing。see--seeingbe--being5.在本单元中,出现了以when和while引导的时间状语从句。when表示“当……的时候”。从句中既可用延续性动词,又可用非延续性动词,这些动词既可以表示动作,又可表示状态。从句中的动作既可和主句的动作同时发生,又可在主句的动作之前或之后发生。如：MarywashavingdinnerwhenIsawher.Theboywasstillsleepingwhenhismothergothomeyesterdaymorning.while表示“在……的时候”、“在……期间”。它强调主句的动作与从句的动作同时发生或主句的动作发生在从句的动作过程中。While从句中必须是表示动作或状态的延续性动词。如：TheweatherwasfinewhilewewereinBeijing.ShecalledwhileIwasout.如果主句的动作在从句的动作过程中发生，从句常用进行时。如:Whilewewereswimmingsomeonestoleourclothes.Don’ttalksoloudwhileothersareworking.总结：1)when可指时间点,又可指时间段,从句中可用延续性动词,也可用非延续性动词。2)while总是指一个时间段,从句中必须用延续性动词。6.过去进行时和一般过去时的区别1)过去进行时表示过去正在进行的动作,而一般过去时则表示一个完整的动作。如：Theywerewritingletterstotheirfriendslastnight.昨晚他们在写信给他们的朋友。(没有说明信是否写完)Theywroteletterstotheirfriendslastnight.他们昨晚写了信给他们的朋友。(表达了他们已写好的意思,整个写的过程已完成)练一练Ⅰ.用所给词的正确形式填空1.What______(be)you______(do)whenhearrived?2.Jim_____________(sleep)whenIcamein.3.They_____________(watch)TVat8:00yesterdayevening.4.Nowhe__________(read)and_________(write).5.Mother_____________(wash)clotheswhenI________(get)homefromschoolyesterdayafternoon.6.Look,mysister_______(be)thereinthebarbershop.Thebarber__________(cut)herhair.7.---When_______you________(see)theaccident?---I______(see)itfifteenminutesago.II.选择最佳答案：1.ShethoughtIwaspraisingherchild,______infact,Iwasscoldinghimforhisbadbehaviorsatschool.A.whatB.whileC.sothatD.therefore2.Idoeverysinglebitofhousework____myhusbandBobjustdoesthedishesnowandthen.A.whileB.sinceC.whenD.As3.PeopleinChinaarealwaysdressed____theirbestclothes___NewYear’sDay.A.at,inB.to,onC.in,onD.in,at4.Wewereswimminginthelake___suddenlythestormstarted.A.whenB.whileC.untilD.before5.---Youseemtohavehadthatcarforyears.---Yes,it‘singoodcondition,butIshouldsellit____itstillruns.A.ifB.beforeC.becauseD.while6._____Jenniferwasreadingamagazine,hissisterwaslisteningtothepopmusic.A.WhileB.WhenC.Whattime7.Iwastryingtodrawacatontheboard_________theteachercamein.A.whileB.whenC.whattime8.MybestfriendvisitedmyhousewhileI_______dinnerinthekitchen.A.co...