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It+be+时间+从句”这类句型用法小结•1.Itis/hasbeen+时间段+since+一般过去时•例1：Itis/hasbeen10yearssincehecamehere.•Itwas+时间段+since(从句用过去完成时)•例2：ItwasyearssincehehadarrivedinChina.(过去时+since+过去完成时)•需要注意的是since从句的谓语动词一般是非延续性动词，但有时也可用延续性动词或表示状态的词，此时需要注意句子的翻译：•例3：Itisthreeyearssinceshecametoourclass.她来我们班已经有三年了。（从动作开始时算起）•Itisthreeyearssinceshewasinourclass.她离开我们班已经有三年了。（从动作结束时算起）•2.It+was+时间点+whenclause(从句谓语用一般过去时):当…的时候，时间是….•It+willbe+时间点+whenclause(从句谓语用一般现在时表将来):当…的时候，时间将是。。。•例1：Itwasalreadyeveningwhenhecameback.当他回家时已经8点了。•例2：Itwillbemiddaywhentheygethome.当他们到家时将是中午。•3.It+will(not)be+时间段+before+现在时：在…发生之前，将要…时间。•It+was(not)+时间段+before+过去时（含义同上）•例1：Itwillbeanotheryearbeforehecomeshere.•例2：Itwassometime______werealizedthetruth.(2005山东24)•A.whenB.untilC.sinceD.before•正确答案：D.过了一段时间后我们才了解了真相。•该句型中before前常用时间段，表示“…之后才…”“在…之前就…”;有时before前也可以用时间点，此时突出表示动作的变化。试比较：•例3：ItwaseveningbeforewereachedthelittletownofTailstocks.•当我们到达Tailstocks时已经黑了。•4.It/Thisis+the+序数词+时间+（that）定语从句(从句用现在完成时)•1：Itisthefirsttime(that)Ihavebeenhere.•该句型可扩展为：Itwas+序数词+时间+(that)定语从句(从句用过去完成时)•例2：Itwasthesecondtimehehadbeenoutwithheralone.•例3：Itisthesecondtimeyou________latethisweek.•A.arriveB.arrivedC.havearrivedD.hadarrive•正确答案:C.•5.Itis+(high)time+that+did(虚拟语气)•相当于Itistime(forsb）todosth.到了该做某事的时候了。•例1：Itis(high)time(that)westoppedpollution.•其中that引导的从句中也可用should+V(原形),should不可省。•例2：Itis(high)time(that)youcame/shouldcomehere.•写作中表示建议时也常可用这类句型。•例3：It‘shightimewetookmeasurestosolvethisproblem•注意应将以上5种句型与强调时间的强调句型的区别：•6.Itbe+时间(被强调部分)+that从句•例1：Itwasat6o’clockthatweheardthenoise.•例2：Itwas3yearsagothathejoinedthearmy.•最简单的判断方法是：强调句型中把itis/was….that去掉，句子能够把持完整。•试比较下面句式与强调句的不同之处：•⑴Itwasalreadyteno‘clockwhenhearrived.•⑵ItistenyearssinceImetyoulast.•⑶Itwasquitesometimebeforehefoundtheelephantatall.•以上几句不是强调句型。•二、巩固练习：注意连词和时态这两方面。•1.Itwasmidnight_______theyoungcouplecamebackfromthepalaceball.•2.Itwasnearlytenyears________theymetagain.•3.Itistwoweeks_______theSmithsmovedtoourvillage.•4.Itwon’tbeaminute_____thesupperisready.•5.ItwasonMondaynight_______allthishappenedtoher.•6.Itwasdark______theycameoutofthehall.whenbeforesincebeforethatwhen•7.Itis10years_______Iranacrosshimlast.•8.Itwon’tbelong______wetakeourexams.•9.Itwillnotbelong_____shecomesback.•10.Itistwomonths_________IsawherinShanghai.•11.ItwasonJuly1st,1997_________HongkongreturnedtoChina.•12.Itwaslastmonth______wegotintouchwitheach.sincebeforebeforesincethatthat•13.ItwasMarch____wecamebacktoschool.•14.ItwasinMarch_____wecamebacktoschool.•15.Itwasnotlong______heworkedouttheproblem.•16.ItwaslastSunday_______Icameacrossafriendofmine.whenthatbeforethat