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1、用于省略if的虚拟条件状语从句：条件状语从句主句与现在事实相反If+主语+Ved(be动词一律用were)主语+would/could+V原与现在事实相反If+主语+haddone主语+would/could+havedone与现在事实相反A:谓语用VedB:weretodoC:should+V原主语+would/could+V原If的省略:当从句中有were,had或should时,可省略if,将were,had或should提到主语前,构成半倒装形式.Were/Should/Had+主语+(not
2、)其他成分=If+主语+were/should/had+(not)其他成分Ifheweremyfriend,Iwouldexpecthishelp.Ifitshouldraintomorrow,Ishouldstayindoors.Ifyouhadn’ttoldmeaboutit,Ishouldneverhaveknownthewholething.(2)Wereitnotfor/Haditnotfor+n.=Ifitwerenotfor/hadn’tbeenfor+n.Ifitwerenotfort
3、heirhelp,wewouldbeinserioustrouble.Ifithadn’tbeenfortheirsupport,wecouldn’thavewontheelection.用于让步和原因状语从句(将表语,动词或副词状语提前)形容词名词(前无冠词)表原因:as(或that)系动词分词++主语+情态动词动词表让步:as(或though)助动词副词谓语动词Strangethoughitmayseem,thetallestboyistheyoungest.=Althoughitmayseems
4、trange,thetallestboyistheyoungest.Tiredthathewas,hewenttobedearly.=Becausehewastired,hewenttobedearly.Womanassheis,shecourageous.=Althoughsheisawoman,sheiscourageous.Cowardashewas,heranawayassoonastheenemyattacked.=Becausehewasacoward,heranawayassoonast
5、heenemyattacked.Surroundedashewasbytheenemy,hewasnotafraid.=Althoughhewassurroundedbytheenemy,hewasnotafraid.Absorbedashewasinthebook,hedidnotnoticemyenteringtheroom.=Becausehewasabsorbedinthebook,hedidnotnoticemyenteringtheroom.Tryashewould,hemightfail
6、again.=Althoughhewouldtry,hemightfailagain.Hardashestudies,hecannotpasstheexam.=Althoughhestudieshard,hecannotpasstheexam.MuchasIlikeyou,Iwillnotmarryyou.=AlthoughIlikeyoumuch,Iwillnotmarryyou.so..that..,such..that..的句子结构中若so,such和与其所修饰的词置于句首，实行部分倒。Sofr
7、ightenedwassheinthedarknessthatshedidn’tdaretomove.SomanyquestionsdidtheyaskmethatIgotconfused.Somuchdoesheworryabouthispositionthathecannotsleepatnight.Suchafiercedogdidhehavethatwehadtowaitbeforewecouldgetin.Suchwastheforceoftheexplosionthatallthewind
8、owswerebroken.注意:如果so/such位于句首修饰主语时,不倒装。Sofewpeoplecametohisbirthdaypartythathefeltdisappointed.程度副词在句首此类副词如:often,well,bitterly,gladlyOftendoeshewarnusnottotouchthepoisonouschemical.WelldoIrememberthedayswhenwewereatschooltogeth
