文档介绍：名词性从句中的虚拟主语从句(itis+adj./)同位语从句(The+)表语从句(n.+bethat)省略if的虚拟法(倒装)(1)虚拟语气中如果从句引导词if/whether省略,从句中需要倒装,提前助动词(系动词)或情态动词。,wewouldnotbeabletohavethesportsmeeting.=Shoulditraintomorrow,(倒装)(2)(may)befineorrainy,wewouldhavethesportsmeeting.=Beitfineorrainy,,shecouldhaveansweredthequestions.=Hadshebeengivenmoreinformation,"insist,suggest,require,request,demand,propose,prefer,maintain,move,urge,mand,order"等动词表"建议、愿望"时,其后宾语从句中谓语动词要用虚拟语气。Should+Vwish其后宾语从句中谓语动词要用虚拟语气。{虚拟语气的名词标志1“necessity”或“suggestion”等名词后面的表语从句或同位语从句中的谓语动词要用虚拟语气。2名词word表“命令”时,其后主语从句、表语从句或同位语从句中,谓语动词需用虚拟语气(should)+V。3wish作名词时其后主语从句,表语从句或同位语从句中,谓语动词需用虚拟语气(should)+V。虚拟语气的形容词标志Itis+,important,vital,decisive,critical,crucial,urgent,strange,desirable,advisable,disappointing,或过去分词充当的形容词如suggested,proposed,advised,demanded,requested,required等时,that句中用should+V表示虚拟。虚拟的介词标志Butfor相当于ifithadnotbeenfor。Butforherhelp,,intheabsenceof等组成的短语可相当于一个虚拟的条件从句。Withoutthelightandheatofthesun,eofalltheanimalsonearth?Intheabsenceofwater,…condition,也可相当于一个虚拟条件从句。Undermorefavorableconditions,“配套”,即错综时间的虚拟。IfhehaddoneasIhadsuggestedthen,hewouldn’’tfoundusthen,’tmadesufficientpreparationfortheexamthen,Iwouldn’(前虚拟后事实)标志:,butIwastoobusy.=IfIhadn’tbeentoobusy,othepartywithyou.(前事实后虚拟)标志:,(were)+tohavedone(不定式完成式)表示“原来想做而未做”后面通常but…(陈述语气)。,,其从句中谓语动词要用虚拟would+V。.(倒装)带否定意义的副词置于句首时(1)带否定意义的词置于句首时,主谓语需要倒装。Rarely