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If引导的条件状语从句1.if引导的条件状语从句可以放在主句之前,也可以放在主句之后,如果放在主句之前,中间要用逗号将主句和从句隔开。例如:IfIamfree,Iwillcometoseeyou.=IwillcometoseeyouifIamfree.如果我有空,我就来看你。2.在含if引导的条件状语从句的复合句中,主句用一般将来时,从句通常用一般现在时态表示将来意义,即“主将从现”原则。例如:Ifitsnowstomorrow,wewillgoskiing.如果明天下雪,我们就去滑雪。3.在含if引导的条件状语从句的复合句中,语句的谓语还可含有情态动词can、must、may等,主句也可是祈使句。例如:Ifitstopsraining,wecangoout.如果雨停了,我们就能出去。4.在含if引导的条件状语从句的复合句中,如果主句部分描述的是客观事实或真理,要用一般现在时。例如:Ifyouheattheice,itturnsintowater.如果你加热冰,它就会变成水。if引导的非真实条件句对过去的虚拟条件从句(if):主语+haddone主句might/would/should/could+havedone对现在的虚拟if+主语+动词过去式(be用were)主句might/would/should/could+do对将来的虚拟if+主语+动词过去式(be用were)或主语+shoulddo或主语+weretodo主句might/would/should/could+doe.g.Tomgottothestationintimebecausehestartedearlier.IfTomhadstartedlate,hewouldhavemissedthetrain.Doyouthinkthethiefenteredthroughthedoor?No,ifhehad,Idon'tbelieve,hewouldhavebrokenthelivingroomwindow.Ifthebookweren'tsoexpensive,Iwouldbuyit.Ifyoudidn'tlivesofaraway,wewouldbeabletovisityoumore.Whatwouldyoudoifyoulostyourpassportinaforeigncountry?Whyhasn'thecome?Ifheshouldnotcomeontime,wewouldhavetoputoffthetrip.2.注意事项e.g.Ifshehadn'tworkhardatEnglishinthepast,shewouldn'tworkaswellasasecretaryinalargecompanynow.混合时间的虚拟语气从句为对过去的虚拟,主句是现在。Hadwenotusedanout-of-datetimetable,wewouldn'thavemissedthetrain.if引导从句的倒装从句相当于ifwehadnotusedanout-of-datetimetable,同样,were还有should在从句中都可以提前,省略if.Ifonly要是...就好了IfonlyIwereyounger!IfonlyIhadworkedharderinmyteenageyears!IfonlyIshouldtraveltomorrow!虚拟语气的十大句型一、虚拟条件句:条件状语从句是非真实情况,在这种情况下要用虚拟语气。1.条件从句与现在事实不一致,其句型为:句型1:If+主语+过去时,主语+should(could,would,或might)+动词原形(1)IfIwereyou,Iwouldstudyhard.(2)Ifitrained,Iwouldnotbeherenow.2.条件从句与过去事实不一致,其句型为:句型2:If+主语+had+过去分词,主语+should(could,would,或might)+have+过去分词(3)Ifthedoctorhadcomelastnight,theboywouldhavebeensaved.(4)IfIhadnotstudiedhard,Iwouldhavefailedintheexamlastterm.3.条件从句与将来事实不一致,其句型为:句型3:If+主语+过去时/should+动词原形/wereto+动词原形,主语+should(could,would,或might)+动词原形(5)Ifitshouldraintomorrow,wewouldstayathome.(6)IfIweretogotothemoononeday,Icouldseeitwithmyowneyes.(7)Ifyoumis