it作形式主语和形式宾语

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1、2.Ifinditdifficulttoremembernewwords.(P144)3.It’snoteasytolearnEnglish(P147)Step1Display:ThreesentencesinUnit10:1.Ifinditdifficulttounderstandforeigners.(P143)it+谓语+adj.+(ofsb./forsb.)todosthStep2Explanation:it作形式主语(formsubject)，真正主语由不定式(todo)或不定式短语（todosth）充当。e.g.a.It’snevertoooldtolearn.活

2、到老，学到老。b.It’sverykindofyoutohelpme.你能帮我真是太好了。c.Itisdifficultforthechildtocarrythebox.这孩子要拿动这个盒子困难。观察例b和例c，想想何时用of,何时用for?b.It’sverykindofyoutohelpme.观察of前的adj.,如果这个形容词可用来描述人，如：clever,kind,careful,careless,foolish,stupid……,那么就用of.上句可理解为：Youareverykind.思考如果形容词不是用来描述人，如：difficult,easy,hard，则选用

3、for.c.Itisdifficultforthechildtocarrythebox.上句：Tocarrytheboxisdifficult.Not:Thechildisdifficult思考观察例b和例c，想想何时用of,何时用for?小试牛刀：2003’16.Itiscareless____thesamemistakeagainandagain.A.foryoumakingB.foryoutomakeC.ofyoumakingD.ofyoutomakeD直击高考：2001’14.It’shard____somuchworkinoneday.A.forhimdoingB.

4、ofhimdoingC.forhimtodoD.ofhimtodo2002’17._____isimpossibletogettotheplacein20minutes.A.HeB.ThatC.ItD.This2009’34._____isclearthatyouwillgetagoodjobbecauseyouaregoodatcommunication.A.ThisB.ThatC.ItD.WhichCCC二、主语+谓语+it+adj.+(forsb.)todosth.it作形式宾语（formobject），真正宾语由todo(短语)充当e.g.Ithinkitisdiff

5、icultforhimtosolvetheproblem.直击高考：2005’24.Doyouthink____necessaryforustodepositthemoney?thatB.itC.weD.them2007’34.Ithink_____quitenecessarytohelpeachother.A.thatB.whichC.thisD.it2010’29.Ifound____formetofinishtheworkbymyself.A.thishardB.thathardC.themhardD.ithardBDD1.Ifinditdifficult(finish

6、)mytaskinfivedays.2.IsnecessaryforustofinishthewallnewspaperbeforetheTeachers’Day.thisB.itC.thatD.what3.改错：Hefindsthisnaturaltoworkforthegoodofthesociety.tofinishBthis改为：itFurtherexercise:拓展：1.下列句中的IT作什么成分呢？a.It’ssaidthatTomhascomebackfromShanghai.b.It’sdoesn’tmatterwhetheritistrueornot.c.I

7、hateitwhenpeopletalkwiththeirmouthfull.d.Ithinkit’snaturalthatweshouldservethep