非真实条件句1)时态:可以表示过去,现在和将来的情况。它的基本特点是时态退后。。if条件从句主句过去完成时should(would)have+过去分词句型:Ifshehadworkedharder,,,Ishould/:eyesterday,,:Hewasillandmissedmanylessons,。if条件从句主句一般过去时should(would)+动词原形Iftheywerehere,+动词原形were+不定式would+动词原形should+eeded,,,,这时主,从句谓语动词的虚拟语气形式因时间不同而不同,这叫做混合条件句。Ifyouhadaskedhimyesterday,youwouldknowwhattodonow.(从句与过去事实相反,主句与现在事实相反。)Ifithadrainedlastnight(过去),itwouldbeverycoldtoday(现在).虚拟条件句的倒装虚拟条件句的从句部分如果含有were,should,或had,可将if省略,再把were,should或had移到从句句首,实行倒装。Weretheyherenow,theycouldhelpus.=Iftheywereherenow,,youwouldhavemethim=eearlier,,thecropswouldbesaved.=shoulditrain,…Betodo…表示将来时ifitweretorain,,:在虚拟语气的从句中,动词'be'的过去时态一律用"were",不用was,即在从句中be用were代替。IfIwereyou,,就会去找他。Ifhewerehere,,一切都会好的。典型例题_____todothework,
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