高中英语 Module 5 Newspapers and Magazines Grammar课件 外研版必修2 课件.ppt

Module5NewspapersandMagazinesGrammar1状语从句时间状语从句Itwillbefourdaysbeforetheycomeback.他们要过四天才能回来。Einsteinalmostknockedmedownbeforehesawme.爱因斯坦几乎把我撞倒才看到我。Afteryouthinkitoverpleaseletmeknowwhatyoudecide.你仔细考虑过以后告诉我你的决定。2.由till或until引导的时间状语从句till和until一般情况下两者可以互换但是在强调句型中多用until。till不可用于句首。要注意的是：如果主句中的谓语动词是瞬时动词时必须用否定形式；如果主句中的谓语动词是延续性动词时用肯定或否定形式都可以但表达的意思不同。Ididn’tgotobeduntil/tillmyfathercameback.直到我父亲回来我才上床睡觉。Iworkeduntilhecameback.我一直工作到他回来为止。Ididn’tworkuntilhecameback.他回来我才开始工作。3.由since引导的时间状语从句since引导的从句的谓语动词可以是延续性的动词又可以是瞬时动词。一般情况下从句谓语动词用一般过去时而主句的谓语动词用现在完成时。但在Itis＋时间＋since从句的句型中从句多用过去时。IhavebeeninBeijingsinceyouleft.自你离开后我一直在北京。ItisfouryearssincemysisterlivedinBeijing.我妹妹不在北京住有四年了。ItisfivemonthssinceourbosswasinBeijing.我们老板离开北京有五个月了。4.由assoonasimmediatelydirectlyinstantlythemomenttheinstanttheminute等引导的时间状语从句这些连词都表示“一……就”。ThemomentIheardthenewsIhastenedtothespot.我一听到消息马上赶到了出事地点。AssoonasIreachCanadaIwillringyouup.我一到加拿大就给你来电话。注意：hardly(scarcelyrarely)…when/beforenosooner…than相当于assoonas之意。主句用过去完成时从句用一般过去时。当hardlyscarcelyrarely和nosooner位于句首时主句应用倒装语序。Hehadhardlyfallenasleepwhenhefeltasofttouchonhisshoulder.Nosoonerhadthesunshownitselfabovethehorizonthanhegotoutofbedtocommencework.5.由bythetime引导的时间状语从句要注意时态的变化：在一般情况下如果从句的谓语动词用一般过去时主句的谓语动词用过去完成时；如果主句的谓语动词用一般现在时主句的谓语动词用将来完成时。如：BythetimeyoucamebackIhadfinishedthisbook.BythetimeyoucomeheretomorrowIwillhavefinishedthiswork.6.由eachtimeeverytime和whenever引导的时间状语从句。EachtimehecametoHarbinhewouldcallonme.Wheneverthatmansays“Totellthetruth”Isuspectthathe’sabouttotellalie.YougrowyoungereverytimeIseeyou.1.Wewereswimminginthelake______suddenlythestormstarted.A.whenB.whileC.untilD.before2.Don’tbeafraidofaskingforhelp______itisneeded.A.unl