选修6句型结构总复习1.while连接的并列句ThestyleofWesternarthaschangedmanytimes,whileChinesearthaschangedlessoften.(P1)while常常用作从属连词，表示“当……的时候”，它也可以连接两个并列句，意为“然而”。eg:IthoughtIheardhimcomeinwhilewewerehavingdinner.while,but,however的区别：(1)while虽然表示转折，但是它侧重于两者之间的对比。eg:ShethoughtIwastalkingaboutherdaughter,whileinfact,Iwastalkingaboutmydaughter.while还可引导让步状语从句，相当于although。eg:WhileIunderstandwhatyousay,Ican’tagreewithyou.(2)but要放在句中，不能用逗号同后面的句子隔开。eg:Hedoesn’tlikemusicbuthiswifedoes.(本句只能用but)(3)however在表示这个意义时是副词，所以用逗号同后面的句子隔开，而且位置也比较灵活，可以置于句首、句中或句末。eg:Thisisonepossiblesolutiontotheproblem.However,thereareothers.2.if引导的虚拟条件句Iftherulesofperspectivehadnotbeendiscovered,peoplewouldnothavebeenabletopaintsuchrealisticpictures.(P2)该句为虚拟语气在条件句中的应用。虚拟语气在条件句中的应用可以有以下三种情况：(1)与过去事实相反：从句用haddone…,主句用would/could/should/might+do。eg:Thehousewouldnothavebeenburntifyouhadbeenmorecareful.(2)与现在事实相反：从句动词用过去时，be动词用were(IfIwereyou…)，主句用would/could/should/might+do。eg:Ifmyunclewerehere,hewouldhelpusdealwiththeproblem.(3)与将来事实相反：从句用过去时，be动词用were；should+do；wereto+do，主句用would/could/should/might+do。eg:Ifyouattendedtomorrow’smeeting,itwouldbemoreinteresting.Ifyouweretosucceed,everythingwouldbeallright.Ifitshouldraintomorrow,weshouldhavetoputoffthetravelplan.通常情况下，在非真实条件句中，主句和从句的谓语动词所指时间是一致的，但有时也可能指不同的时间，这时要根据上下文的意思采用不同的谓语动词形式，也就是混合条件句。eg:Ifyouhadlistenedtomecarefullyyesterday,youwouldbeabletoanswermyquestionsnow.(从句与过去事实相反，主句与现在事实相反，因为有现在时间状语now。)3.see+宾语+宾补Isawahousebowtoasquire,…(P10)see后面的复合结构很复杂，在这个句子中是接不带to的动词不定式。在此种情况下，往往表示将来的动作或是过去完成的动作，而且这个动作往往是瞬间发生的。eg:Isawathiefslipintomyneighbour’shouse.(1)在“see+宾语+过去分词”这个结构中，宾语与后面的过去分词存在逻辑上的动宾关系。eg:Justnow,Isawanoldmanknockeddownbyaspeedingcar.(2)“see+宾语+动词–ing形式”这个结构表示看到某动作正在进行。eg:Themissingchildwaslastseenplayingbytheriver.(3)“see+宾语+beingdone”表示看到某事正在被做。eg:WhenIwaspassingbyBeijing,Isawmanygymsandstadiumsbeingbuiltforthe2008OlympicGames.4.as+adj.+a(n)+n.+as…IdohopesobecauseIwantyoutoliveaslongandhealthyalifeasIhave.(P18)“as+adj.+a(n)+n.+as…”结构中，将形容词提前，前提是后面的名词前必须有不定冠词a或an。eg:Ihaveneverseenasoldacarasthisone.适用于这个句型的词还有too,how,so等，要求名词前面要有不定冠词a或an。eg:Thisistoodifficultaproblemformetoanswer.Howinterestingastoryitis!1Ihavenevermetsoyoungamanwithsowiseahead.5.everytimeEverytimeyoufeellikesmokingacigarette,remindyourselfthatyouareanon-smoker.(P19)everytime在这个句子中用作连词，引导时间状语从句，相当于whenever，译为“每……就”。此外eachtime也可用来引导这样的句子。eg:Don’talwaysturntodictionaryeverytimeyoumeetwithanewword.I’dthinkofmyhometowneachtimeIlistentothissong.在英语中，还有许多普通词或短语被用作连词：themoment(second,minute,instant),theyear,nowthat,inthat,seeingthat(由于),onconditionthat,solongas等。eg:Themoment/minute/secondyouarriveatthestation,pleasetelephoneme.Solongasyou...
