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Unit7ProtecttheEarthIntroduceIcanuse___to____.Weshould_______.Weshouldnot_______.Words“use+名词+to+动词原形”意思是用某物做某种东西。to后接动词原形。常用短语：protecttheearth保护地球eg：Shealwaysusestoomuchwatertocleanthings.她总是用太多的水来清洗东西。小练习：Inthepast,weoften_____(use)woodtomakefire..useduse…to…Words(1)usedto表示过去常常做某事。(2)beusedto+doing：“习惯于···”,to是介词,后需加名词或动名词。eg：Iusedtoplayfootballafterschool。过去我常常在放学后踢球。Use···to···扩展eg：Sarahisusedtotakingawalk。Sarah习惯于散步了。WordsShould“应该”,后接动词原形,是较委婉地建议某人做某事。当表示较委婉的拒绝某人做某事时：用其否定形式“shouldn’t+动词原形”。eg：Weshouldfinishourhomeworkeveryday.我们每天都应该完成家庭作业。小练习：（）Waterisuseful,we_____reuseandsaveit.A.shouldB.shouldn’tC.willAshould/ʃʊd/DialoguesGroupwork：Writemoresentenceswithlearnedsentencesandreportinclass.Expand(1)(表示能力)能···;会···can作情态动词用法eg：Shecandrive，butshecan’trideabicycle.他能开车,但是不会骑自行车。(2)(表示可能、许可)能够···;可以···eg：Youcan’tparkyourcarinthisstreet.你不可以在这条街上停车。Expandcould/beableto区别could表示“原来具备某种能力,现在没有这种能力了”。但was/wereableto则表示过去成功地做成了某事。eg：Icouldswimallthewayacrossthelake，butIcan’tnow.我原来能游过这个湖,但现在不能了。Thefirespreadthroughthehotelveryquicklybuteveryonewasabletogetout.大火很快蔓延了整个旅馆,但全体人员都脱离了危险。SummaryUse···to···shouldExercise()1.Theoilis.A.useB.reuseC.useful()2.Tokeeptheairclean,don’ttoworkeveryday.A.walkB.runC.driveCCExercise()3.Weoftenusetocleanthings.A.coalB.oilC.water()4.Theresomepaperonthedesk.A.hasB.isC.areCBExercise()5.Peoplecutdowntreeseveryday.A.lotofB.manyC.much()6.Wecanusepaperatoyplane.A.makeB.makingC.tomakeBCExercise()7.Thereareplasticbagsontheground.A.toomuchB.toomanyC.somuch()8.ToprotecttheEarth,weshoulduse.A.plasticbagsB.plasticbottleC.glassbottleBCHomeworkCollectmoreexamplesofenvironmentaldamage,writeasmallreport，reportshowingintheclass.