1.bedoing/beabouttodo/beonthepointofdoing/haddone…,when…（when：这时，强调一个动作的突然发生）1)Iwaswalkingalongtheriver,whenIheardadrowningboycryforhelp.2)Iwasabouttoleavewhenitbegantorain.3)Ihadjustfinishedmytestpaperwhenthebellrang,announcingtheexamwasover.2.Itwas(not)+时间段+before+一般过去时“过了一段时间就……”Itwill(not)be+时间段+before+一般现在时“要过一段时间才会……”Itis/hasbeen+时间段+since…Itwas+点时间+when…Itwas+时间状语+that…（强调句）1)Itwasnotlongbeforehesensedthedangeroftheposition.不久他就意识到他处境危险。（动作已发生）2)Itwillbehalfayearbeforeyougraduatefromtheschool.还有半年你才从这个学校毕业。（动作未发生）3)Itis3yearssinceheworkedhere.=helefthere.（since从句中的谓语动词若是延续性动词，要从这个动作结束的时候算起）4)Itwas3o’clockwhentheyreceivedthetelephone.5)Itwasat3o’clockthattheyreceivedthetelephone.3.once…一旦……，表示时间和条件1)Onceyoustart,youwillnevergiveup.2)Onceyouunderstandwhattheteacherexplained,youwillhavenodifficultydoingthework.4.the+比较级……，the+比较级……“越……越……”Themorebooksyouread,themoreknowledgeyouwillget.5.whether…or…无论是……还是……1)Whethertheweatherisgoodorbad,theywillsetoffastheyplanned.2)Anyperson,whetheryoungorold,hashisownworth.6.祈使句+or/otherwise+结果句或祈使句+and+结果句1)Stopdoingsuchafoolishthing,oryouwillbepunishedintime.2)Moreeffort,andtheproblemwouldhavebeensettled.7.everytime/eachtime/nexttime/thefirsttime/anytime等短语引导时间状语从句，表示“每当，每次，下次，第一次，任何时候”。1)Everytimeyoumeetwithnewwordswhilereading,don’talwaysrefertoyourdictionary.2)Nexttimeyoucome,doremembertobringyoursonhere.3)Youarewelcometocomebackanytimeyouwantto.8.Thereis(no)needtodo…Thereis(no)hope/chance/possibilityofdoing…Thereis(no)difficulty/trouble/point/delay(in)doing1)Isthereanychanceofourwinningthematch?2)Thereisnopointindiscussingtheproblemagain.9.it强调句：基本构成形式：Itis/was+被强调部分+who/that+原句剩余部分Imethiminthestreetyesterdayafternoon.ItwasIwho/thatmethiminthestreetyesterdayafternoon.（强调是我，不是别人）ItwasinthestreetthatImethimyesterdayafternoon.（强调是在大街上，不是在别的地方，强调的是地点，但不用where）ItwasyesterdayafternoonthatImethiminthestreet.（强调是昨天下午，不是在别的时候，强调的是时间，但不用when)10.not...until直到……才1)Thevillagersdidn’trealizehowseriousthepollutionwasuntilallthefishdiedintheriver.2)Itwasnotuntilallthefishdiedintheriverthatthevillagersrealizedhowseriousthepollutionwas.（强调句）3)Notuntilallthefishdiedintheriverdidthevillagersrealizehowseriousthepollutionwas.（倒装句）11.notonly…but(also)…引导并列结构：作主语时，谓语动词与邻近的一个主语保持一致。Notonlytheteacherbutalsothestudentshavetheireyesexaminedregularly.notonly...but(also)…引导并列句时，notonly引导的部分置于句首时要部分倒装。1)Notonlywaseverythinghehadtakenaway,butalsohisGermancitizenshipwastakenaway.2)Notonlyshouldwestudentsstudyhard,butalsoweshouldknowhowtoenjoyourselvesinoursparetime.12.wouldrather+从句（从句要用虚拟语气，即从句中谓语动词用一般过去式，表示现在或将来的愿望；从句中谓语动词用过去完成市，表示对过去的愿望）1)I’dratheryoupostedtheletterrightnow.我想让你现在就把信寄出去。2)I’dratherIhadn’tseenheryesterday.我情愿昨天没见到她。13.so,neither/nor引导得倒装表示“另一者也如此”及前者的情况也适用于后者，用so,neither/nor引导的倒装句，助动词的选择依据前一句的谓语动词。1)Hehasfi...
