高中英语 外研版选择性必修二 Unit 5 A delicate world Developing ideas 课件（共58张PPT）（2025年）.pptxVIP

Unit5AdelicateworldUsinglanguageITasanemptyobjectBYMICHELLE

1Whatdoesitrefertoinsentences(a)and(c)?2Whatisthedifferencebetweenthesentencesineachgroup?Whentheobjectofasentenceisathat-clause(b)oraninfinitive(d),wesometimesuseitasanemptyobjectandputtherealobjectlatertokeepbalance.Forexample,sentence(a)usesitastheemptyobjectofthink,referringtotherealobject:theislandisaUNESCOWorldHeritageSite.Sentence(b)usesthat-clauseastheobjectofthink.aNovisitorwouldthinkitsurprisingthat|theislandisaUNESCOWorldHeritageSite,bNovisitorwouldthinkthattheislandbeingaUNESCOWorldHeritageSiteissurprising.cExpertsfeltitnecessarytocomeupwithaplantoremovealltherabbitsfromtheisland.!dExpertsfelttocomeupwithaplantoremovealltherabbitsfromtheislandwasnecessary.Lookatthesentencesandanswerthequestions.Sentencesand(c)arefromthereadingpassage.

Thisincidentmadeitclearthattherat,mouseandrabbitproblemneededsolvingonceandforall.·..butwehumansoweittotheislandtogiveitahappyending.Nowlookformoresentenceswiththisstructureinthereadingpassage,andsummariseitsuseinyourownwords.Possibleanswer·

It作形式宾语不定式真正的宾语是动名词从句rammar条件有宾语补足语具备了这两个条件，形式宾语it一定要用。

Ifinditpleasanttoworkwithhim.Theyfeltitdifficulttofinishtheworkinsuchashorttime.Shethinksitherdutytohelphim.Allthesenoisesmadeitimpossibleformetogoonwiththework.1.it代替不定式短语。常用于：think/find/feel/consider/make/regard...it+adj./n.+todoit作形式宾语的常见情况归纳如下：····

Theprofessorconsidersitnogoodreadingwithoutunderstanding.Doyouconsideritanyusearguingwithhim?Idontthinkitworthwhilegoingtosuchaplace.2.it代替v.-ing只限于少数句型。consider/think/find...it+good/use/worthwhile..+doing….it作形式宾语的常见情况归纳如下：··

3.it代替宾语从句(that有时候可以省略)。think/find/