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It’simportantforyoutostudyhard.这里的it是形式主语，那么真正的主语是什么呢？It不是代词么？什么是形式主语啊？了解“It”作形式主语的含义了解“It’s+adj.+（of/forsb）todosth.”句式的形态特征了解“It’s+adj.+(of/forsb）todosth.”句式的功能辨别该句式中of/for的使用Findthesubject（主语）inthefollowingsentences.•Thewebsitetakesyoutodifferentplacesaroundtheworld.•SydneyisthelargestcityinAustralia.•Wewenttoaseafoodrestaurantonthefifthday.主语表明这句话说的是谁和什么，一般位于句首。It’simportantforyoutostudyhard.虽为主语，但无实际意思。“形式主语”“真实主语”Tostudyhardisimportantforyou.避免“头重脚轻”It’s+adj.+todosth.sad,necessary,important,wrong,possible,hard,difficult,easy,good,impolite…Itis______togiveseatstotheelderlyonthebus.politeItis_____________todovoluntarywork.meaningful1.TheReadingClubisfuntojoin.2.Tofinishtheworkwithinanhourisdifficult.3.Thisquestioniseasytoanswer.Rewritethefollowingsentences:Itis+adjective+to+doItisdifficulttofinishtheworkwithinanhour.Itiseasytoanswerthisquestion.ItisfuntojointheReadingClub.Weshouldhelpthedisabledclimbupthesteps.Itisgood.Weshouldtakegoodcareoftheold.Itisimportant.Weshouldhelpthehomelessbuildtheirhomes.Itiskind.Weshouldhelptheblindcrosstheroad.Itishelpful.1.It’sgoodtohelpthedisabledclimbupthesteps.2.It’simportanttotakegoodcareoftheold.3.It’skindtohelpthehomelessbuildtheirhomes.4.It’shelpfultohelptheblindcrosstheroad.Rewritethesentences.•儿童学好礼仪是很重要的。•你能帮我，真好。TranslationIt’sveryimportanttolearngoodmanners.forchildren•It’sverykindtohelpme.ofyouIt’s+adj.+ofsb.+todosth.It’s+adj.+forsb.+todosth.用介词for或of引出动作描述对象•Itisnice____youtohelpmedothisjob.•Itisgood____youtodomorningexercises.offor用介词for或of引出对象什么时候用of,何时用for呢？Canweuseboth？Thekeyistounderstandtheadj.当形容词修饰人时，用介词ofoffor•Itisnice____youtohelpmedothisjob.•Itisgood____youtodomorningexercises.当形容词修饰不定式的动作时，用介词forD---Didyoufeel____wasselfishofJamestohidethecomicbooks?---Yes.Itisimportant____aboytolearntoshare.A.that;ofB.that;forC.it;ofD.it;forItisnecessary______peopletokeepourcityclean.forItisimpolite_____themtodroplittlereverywhere.ofIt’spolite_____himtoqueueforhisturn.offorsb.todosth.ofsb.todosth.Itis+adj.+todosth.Wecanusethestructurestoexpressourfeelingsandopinions.Tips为避“头重和脚轻”形式主语it来充当;真实主语不定式;句型旨在表观点;引出对象of或是for;修饰人物就用of；修饰动作行为就用for。