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1、主句與從句的動作發(fā)生在不同的時(shí)間,這時(shí)主,從句謂語動詞的虛擬語氣形式因時(shí)間不同而不同,這叫做混合條件句。Ifyouhadaskedhimyesterday,youwouldknowwhattodonow.(從句與過去事實(shí)相反,主句與現(xiàn)在事實(shí)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(shí)行倒裝。Weretheyherenow,theycouldhelpus
2、.=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(shí)態(tài)一律用"were",不用was,即在從句中be用were代替。IfIwereyou,Iwouldgotolookforhim.如果我是你,就會去找他。Ifhewe
3、rehere,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(gè)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WereInottodo.,而不能說Weren'tItodo.5特殊的虛擬語氣詞:should1)
4、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,natural,strangeapity,ashame,nowonder(3)Itissuggestedthatwe(
5、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)holdameetingnextweek.Heinsistedthathe(should)besentthere.注意:如suggest,insi
6、st不表示"建議"或"堅(jiān)持要某人做某事時(shí)",即它們用于其本意"暗示、表明"、"堅(jiān)持認(rèn)為"時(shí),賓語從句用陳述語氣。Theguardatgateinsistedthateverybodyobeytherules.判斷改錯(cuò):(錯(cuò))Youpalefacesuggeststhatyou(should)beill.(對)Yourpalefacesuggeststhatyouareill.(錯(cuò))Iinsistedthatyou(should)bewrong.(對)Iinsistedthatyouwerewrong.3)在表語從句,同位語從句中的應(yīng)用在suggestion,prop
7、osal,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wish后面的從句,表示與事實(shí)相反的情況,或表示將來不太可能實(shí)現(xiàn)的愿望。其賓語從句的動詞形式為:真實(shí)狀況wish后從句動作先于主句動詞動作過去時(shí)過去完成時(shí)(be的過去式為were)從句動作與主句動作