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1、Unit5ThePowerofNatureGrammarandUsefulStructuresReviewtheusageof–ingform:1.Writethefollowingpairsofsentences(orothersimilarones)ontheboard.Iwasfeelingtired.Iwenttobedearly→feelingtiredIwenttobedearlyIworkedhardallday.Iwenttobedearly→Havingworkedhardallday,Iwenttobedearly.
2、2.AskstudenttoconsiderwhentheactionineachpairofsentenceshappenedandLeadthemtounderstandthatinthefirstpairofsentences,thefeelingandtheactionarehappeningatthesametime;whereasinthesecondpair,theworkingalldayhappenedbeforehe/shewastired3.Examinethesentencesbelowanddiscussinw
3、hatwaythestructuressimilartoeachotherandinwhatwaytheyaredifferentLookingcarefullyattheground,Imademywaytotheedgeofthecrater.HavingexperiencedquiteafewearthquakesinHawaiialready,Ididn’ttakemuchnotice.Having+pastparticiple(theperfect–ingform)torefertoanactionthattookplaceb
4、eforethetimeexpressedbymainverb.4.ReadanddiscussExercise1intheSB5.SetExercise2.checkanswersanddiscussstructures.6.SetExercise3,4and5.checkanswersaftereachexerciseanddiscussreasonsforthestructuresused.7.小结-ing形式的用法1)–ing形式作状语用法例句时间Walkingalongthestreet,ImetMary.(=WhileIwa
5、swalkingalongthestreet….)在街上走的时候，我遇到了玛丽。条件Turningtotheleft,youwillfindtheschool.(=Ifyouturntotheleft,….)向左走，你就会找到那个学校让步KnowingwhereIlive,henevercometoseeme.(=ThoughheknowswhereIlive,….)尽管他知道我的住处，但从不来看我。伴随Istoodthere,waitingforher.(=…,andwaitedforher.)我站在那儿等她原因Beingtired,
6、Istoppedtotakearest.(=BecauseIwastired,….)因为疲倦，我停下来休息。结果Itrainedheavily,causingseverefloodinginthearea.(=Itrainedheavilysothatitcausedseverefloodinginthearea.)在这个地方雨下的如此大，以至引发了洪灾。2)–ing形式的完成式(Havingbeen)+p.p.…,主语+谓语被动主动Havingfinishedmywork,Iwenthome.(=AfterIhadfinishedmy
7、work,….)工作做完只后，我就回家了。例句u–ing形式的完成式所表示的时间在谓语动词之前u表示被动可直接用过却分词用法Having+p.p.…,主语+谓语句型3）.使用-ing形式需注意的几个问题:.①分词(短语)作状语时，其逻辑主语必须与句子的主语一致。如果不一致，必须用独立主格结构来表示，也就是在分词前面加上它的逻辑主语。MywifehadalongtalkwithSally,explainingwhyshedidn’twantthechildrentoplaytogether我妻子与莎莉谈了很长时间，解释她为什么不想让孩子们
8、在一起玩。(现在分词explaining是句子主语mywife做的动作，它们之间是主动关系,即explaining的逻辑主语，就是句子的主语mywife。)Thetrainhavinggone,wehadt
