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1、1.It’simportanttoprovidestudentswithagoodlanguageenvironment./Toprovidestudentswithagoodlanguageenvironmentisimportant.2.Ajournalistwantstointerviewthefirstprizewinnerofthecontest.3.MydreamistobeascientistwhenIgrowup.4.Toimproveherlisteningskills,Lifa
2、ngoftenwatchesTVprograms.①Whichpartsoftheabovesentencesareinfinitivephrases?theblackpartortheredpart?②Whataretheirfunctions,aretheythesubjects,objects,predicativesortheadverbialofthesentences?1.It’simportanttoprovidestudentswithagoodlanguageenvironmen
3、t.Toprovidestudentswithagoodlanguageenvironmentisimportant.①Whichoftheabovesentencesisbetter?Why?Whatdoes“It”herereferto?Whydoweuse“it”hereinsteadoftheinfinitivephrasesatthebeginningofthesentences?Canyoufindmoresentenceswithinfinitiveassubjects,object
4、s,predicativesortheadverbialsinthetext?动词不定式动词不定式的基本形式是“to+动词原形“,有时可以不带to.动词不定式没有人称和数的变化,在句子中不能作谓语。在句中可以作主语、表语、宾语、宾语补足语、定语和状语。找出句子中的不定式,并说出作用:1.Ittakesyoutenminutestogetthere.2.Ihopetoseehimsoon.3.Hiswishistobecomeanartist.4.Peopleeattolive,butnotlive
5、toeat.状语表语宾语主语动词不定式作主语Itis+adj.+(forsb.)todosth.Itis+adj.+(ofsb.)todosth.Ittakessb.sometimetodosth.4.用作主语TobehereatChristmastimeismydream.2.Togoabroadishisdream.3.Tosayiseasy,todoisdifficult.(这时可将其用形式主语it来替换)→ItismydreamtobehereatChristmastime.→Itishi
6、sdreamtogoabroad.→Itiseasytosay,itisdifficulttodo.1.跳舞非常有趣。2.种些植物是非常有必要的。Todanceisalotoffun.Itisalotoffuntodance.Togrowplantsisveryimportant.3.说英语对我来说并不容易。4.听到你的声音真高兴。Tohearyourvoiceissonice.Itissonicetohearyourvoice.TospeakEnglishisnoteasyforme.It’s+
7、+(for+sb.)+todosth.It’s+difficult,hard,easy,possible,impossibleimportant,`+(of+sb.)+todosth.clever,wise,kind,good,right,nicewrong,bad,cruelsilly,stupid,foolishcareful,carelessⅧ.e.gItishard___youtodoitwell.=Foryoutodoitwellishard.Itiskind___youtohelpme
8、.=Youarekindtohelpme.forofIt’sclever__himtosayso.Itisimpossible__youtofinishit.Itwaswrong__youtotellalie.Itwascareless___youtomakesomanymistakesintheexam.Itissilly__hertodosuchathing.Itisimportant___youtolearnEnglishwell.offorofofoffore.g非谓语动词