九年级英语人教版：Unit 13 Were trying to save the earth!Section A Grammar focus 4a—4c-教学课件.pptx

Unit13We’retryingtosavetheearth!(SectionAGrammarFocus4a-4c)年级：八年级学科：初中英文（人教版）

LearningobjectivesBytheendoftheclass,youwillbeableto:1.reviewpresentprogressive,usedto,passivevoice,presentperfectandmodalverbs2.havetheconsciousnessofprotectingtheenvironmentandknowwhattodotomaketheearthabetterplace

Whatkindofpollutiondoyouknow?Let’stalkpollutionairwaterlandnoisewaste...Theearthisbadlypolluted.Wehaveseenmanychangesintheenvironment.Thewaterusedtobesoclean.Thewaterpollutionisgettingworseandworse.Weshouldtakeactiontosavetheearth.

Let’sreviewTheearthisbadlypolluted.Wehaveseenmanychangesintheenvironment.Thewaterusedtobesoclean.Thewaterpollutionisgettingmoreandmoreworse.Weshouldtakeactiontohelpsavetheearth.PresentprogressivePresentperfectModalverbsPassivevoiceusedto

We’retryingtosavetheearth.ModalverbsTheriverusedtobesoclean.PresentprogressiveTheairisbadlypolluted.Noscientificstudieshaveshownthatsharkfinsaregoodforhealth.PassivevoiceWeshouldhelpsavethesharks.PresentperfectGrammarFocusWe’retryingtosavetheearth.Theriverusedtobesoclean.Theairisbadlypolluted.Noscientificstudieshaveshownthatsharkfinsaregoodforhealth.Weshouldhelpsavethesharks.usedto

现在进行时:PresentprogressiveWe’retryingtosavetheearth.Nowpeoplearetakingactiontosavewildanimals.Theairpollutionisgettingworseandworse.Look!Thefactoryisputtingwasteintothewater.meaningformuse现在进行时表示（说话瞬间）正在进行或发生的动作，也可表示当前一段时间内的活动或现阶段正在进行的动作。be（am,is,are）+v.ing(动词的现在分词)标志性词汇：now，rightnow，Look，Listen现在分词的构成：1.一般情况下在动词词尾加-ing。如：go-going2.以不发音的e结尾的动词，去掉e加-ing。如：have-having3.以一个辅音字母结尾的重读闭音节，双写最后一个字母，再加-ing。如：stop-stopping。

现在完成时:PresentperfectNoscientificstudieshaveshownthatsharkfinsaregoodforhealth.Wehaveseenmanychangesintheenvironment.Hehaskeptthisbookforover