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1、主句與從句的動作發(fā)生在不同的時間，這時主，從句謂語動詞的虛擬語氣形式因時間不同而不同，這叫做混合條件句。Ifyouhadaskedhimyesterday,youwouldknowwhattodonow.（從句與過去事實相反，主句與現(xiàn)在事實相反。）Ifithadrainedlastnight(過去),itwouldbeverycoldtoday(現(xiàn)在).4.虛擬條件句的倒裝虛擬條件句的從句部分如果含有were,should,或had,可將if省略，再把were,should或had移到從句句首，實行倒裝。Weretheyherenow,t
2、heycouldhelpus.=Iftheywereherenow,theycouldhelpus.Hadyoucomeearlier,youwouldhavemethim=Ifyouhadcomeearlier,youwouldhavemethim.Shoulditrain,thecropswouldbesaved.=Wereittorain,thecropswouldbesaved.注意：在虛擬語氣的從句中，動詞'be'的過去時態(tài)一律用"were"，不用was，即在從句中be用were代替。IfIwereyou,Iwouldgotol
3、ookforhim.如果我是你，就會去找他。Ifhewerehere,everythingwouldbeallright.如果他在這兒，一切都會好的。典型例題_____todothework,Ishoulddoitsomeotherday.A.IfwereIB.IwereC.WereID.WasI答案C.在虛擬條件狀語中如果有were,should,had這三個詞，通常將if省略，主語提前,變成were,should,had+主語的形式。但要注意，在虛擬條件狀語從句中，省略連詞的倒裝形式的句首不能用動詞的縮略形式。如我們可說WereIno
4、ttodo.,而不能說Weren'tItodo.5特殊的虛擬語氣詞：should1）Itisdemanded/necessary/apity+that…結(jié)構(gòu)中的主語從句的謂語動詞要用should加動詞原形，should可省略。句型：(1)suggestedItis(2)importantthat…+(should)do(3)apity(1)suggested,ordered,proposed,required,demanded,requested,insisted；+(should)do(2)important,necessary,nat
5、ural,strangeapity,ashame,nowonder(3)Itissuggestedthatwe(should)holdameetingnextweek.Itisnecessarythathe(should)cometoourmeetingtomorrow.2）在賓語從句中的應(yīng)用在表示命令、建議、要求等一類動詞后面的從句中。order,suggest,propose,require,demand,request,insist,command,insist+(should)doIsuggestthatwe(should)hol
6、dameetingnextweek.Heinsistedthathe(should)besentthere.注意：如suggest,insist不表示"建議"或"堅持要某人做某事時"，即它們用于其本意"暗示、表明"、"堅持認(rèn)為"時，賓語從句用陳述語氣。Theguardatgateinsistedthateverybodyobeytherules.判斷改錯:（錯）Youpalefacesuggeststhatyou(should)beill.(對)Yourpalefacesuggeststhatyouareill.(錯)Iinsistedt
7、hatyou(should)bewrong.(對)Iinsistedthatyouwerewrong.3）在表語從句，同位語從句中的應(yīng)用在suggestion,proposal,idea,plan,order,advice等名詞后面的表語從句、同位語從句中要用虛擬語氣，即（should）+動詞原形。Myideaisthatwe(should)getmorepeopletoattendtheconference.Imakeaproposalthatwe(should)holdameetingnextweek.6.wish的用法1）用于wis
8、h后面的從句，表示與事實相反的情況，或表示將來不太可能實現(xiàn)的愿望。其賓語從句的動詞形式為：真實狀況wish后從句動作先于主句動詞動作過去時過去完成時（be的過去式為were）從句動作與主句動作
