来源时间为：2017-10-17
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)doing
1)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)Hehasfinishedhishomework,sohaveI.
2)Mysisterpreferscoffee,sodoI.
3)Johncan’trideabicycle,neither/norcanI.若前句的谓语动词既有肯定又有否定形式时，或谓语动词不属于一类时，用Itis/wasthesamewithsb.或Soitis/waswithsb.
1)Heisaworkerandheworkshard,soitiswithJohn.若后一句是对前一句所说的内容表示赞同或认可，则主语和谓语不倒装。
1)—Itiscoldtoday.—Yes.Soitis
2)—HevisitedTokyolastweek.—Yes.Sohedid.
14.倍数表达法：
A 谓语 倍数 the n.(size/height/length…) ofB
A 谓语 倍数 as abj. asB
A 谓语 倍数 adj.比较级 thanB
A 谓语 adj.比较级 thanB by 倍数
1)Thissquareistwicethesizeofthatone.Thissquareistwiceaslargeasthatone.Thissquareisoncelargerthanthatone.
2)Thisfactoryproducedthreetimesasmanycarsastheydid10yearsago.
3)Heis3yearsolderthanIHeisolderthanIby3years.
15.as/with表示“随……进展”，as后面接句子，with后面接短语。
1)Withtheindustrydeveloping,thepollutionisbecomingmoreandmoreserious.
2)Astheindustrydevelops,thepollutionisbecomingmoreandmoreserious.
16.with的复合结构(作状语或作定语)with n. adj.(with可以省略)
1)(With)thestreetwetandslippery,wehadtorideourbikesslowlyandcarefully.Becausethestreetwerewetandslippery,…
2)Thestudentswerelisteningtotheteacher,(with)theireyeswideopen.Thestudentswerelisteningtotheteacher,andtheireyeswerewideopen.with n. adv.(with可以省略)
1)Heputonhiscoathurriedly,(with)thewrongsideout.
with n. prep-phrase(with可以省略)
1)Theoldmanwasseatedinthesofa,(with)apipeinhismouth.with n. todo/tobedone(动词不定式的动作还未进行)
with n. doing/beingdone(动词不定式的动作正在进行)
with n. done(动词不定式的动作已经完成或指n.所处的状态)
1)Withsomanyproblemstosettle,thenewly-electedpresidentishavingahardyear.
2)Hewaslyinginbed,withhiseyesfixedontheceiling.
3)Withthetemplebeingrepaired,wecan’tvisitedit.
17.以here,there,in,out,up,down,away等副词开头的倒装句(多用一般现在时表示正在进行的动作)。
1)Herecomesthebus！(=Thebusiscominghere！)
2)Awayhewent.他走远了。(若主语是代词则主语与谓语不倒装)
18.方位状语位于句首时的倒装句。
1)
