人教版高二英语Unit 4 Learning about Language课件.ppt

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1、Unit4GlobalwarmingLearningaboutLanguage1.Reviewsomeimportantlanguagepoints.2.CheckuptheanswersoftheexercisesonP28.3.LearnanewGrammar—It的用法及强调结构Gooverthenewwordsandphrasesintheprevioussections.Thencompleteeachsentencewithoneofthosenewwordsorphrases.Discoveringusefulwordsandexpressio

2、ns1.CharlesKeelingcollected______onthecarbondioxidecontentintheatmosphereoveraforty-yearperiod.Hefoundthattheamountofcarbondioxide_______increasingduringthattime.2.Althoughweareburningcoalinhuge_________everyyear,wewon’t________ofitforcenturies.3.Iftheamountofgreenhousegasescontinu

3、esto_______,wecouldbefacingaglobal__________.datakeptonquantitiesrunoutbuildupcatastrophe4.Manyscientistsbelievethatglobalwarminghas__________throughtheburningoffossilfuels.comeabout5.The_____________ofarisingsealevelwouldbewidespreadflooding.6.Onthewholethewarmingoftheearthisa____

4、________thatcausesgreatconcern.7.The__________showstemperaturechangesduringthe20thcentury.8.Onehectareofforestcanabsorb23tonsofcarbondioxide____year.consequencephenomenongraphper9.Thewashingmachineusestoomuchenergy,but_________webuyamoreeconomicalone,itwouldstillusetoomuchwater.10.

5、Thecaraccidentonthemainroadyesterday___________onedriver’sdeath.evenifresultedinIt的用法及强调结构1.代词（1）用作人称代词,代替前文提到的事物。Mywatchismissing.Ican’tfind(it)anywhere．Herfatherhasgoneabroad.Haveyouheardabout(it)?（2）代替指示代词this,that。What’sthis?(It’s)acomputer．Whosepenisthat?(It’s)mine．（3）表示时间、天气、

6、距离、季节、度量等。It’stimeforlunch.It’sgettingwarmerandwarmer．It’sfortyyearssincemyhometownwasliberated．It’ssummernow．Howfarisitfromheretotheairport？It’sabouttwentyminutes’walkfromheretothebusstop．2.引导词（1）作形式主语,代替由不定式,动名词或从句表示的真正主语。其基本句型为：It(形式主语)+adj.+to+v.It(形式主语)+adj.+that(subject(主语)+v

7、.)It(形式主语)+adj.+whether(subject+v.)Itis＋adj.＋for／(of)sb.todosth.It＋seems(appears)＋that(subject＋v.)happens①Itisveryimportanttohelpeachother．相互帮助非常重要。②Itisnouse/uselessgoingthereagain．再去那里是没有用的。③Itseemsthathehascaughtacold.=Heseemstohavecaughtacold．④Is____ possibletomasteraforeignlan

8、guageintwomonths?A.nowB.th