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8BUnit6SunshineforallGrammarthedisabledtheelderlythedeafthehomelessWhoneedsourhelp?It’smeaningfultohelpthem.Whatcanwedoforthem?Free-talkIt’simportanttogiveherfood.It’simportanttogiveherfood.It’s+adj+todosth.It’s+adj+todosth.It’snecessarytohelpthepeoplethere.It’snecessarytohelpthepeoplethere.It’s+adj+todoIt’s+adj+todosth.sth.Isitfantastictoworkasavolunteer?IsitimportanttosupporttheSpecialOlympicsWorldGames?Yes.Itisfantastictoworkasavolunteer.Yes.ItisimportanttosupporttheSpecialOlympicsWorldGames.Itisadjectiveto-infinitiveItisfantastictoworkasavolunteer.improtanttosupporttheSpecialOlympicsWorldGames.WeuseItis+adjective+to-infinitivetoexpresswhatwethinkaboutsomething.句型：It’s+adj.+todosth形式主语真正的主语用法：该句型中的形容词表示不定式所具备的特征或客观情况。意思：“做某事是......”=Doing/Todosth.is+adj.e.g.ItisimportanttolearnEnglishwell.=Tolearn/LearningEnglishwellisimportant.donategivehelpkeepplanttakecareof______________________________________(right/seats/theelderly/to)It'srighttogiveseatstotheelderly.Waystohelp_____________________________________(good/blindpeople/crosstheroad)It'sgoodtohelpblindpeoplecrosstheroad.donategivehelpkeepplanttakecareof______________________________________(helpful/money/tocharities)It'shelpfultodonatemoneytocharities.donategivehelpkeepplanttakecareof__________________________________(proper/alostpet)It'spropertotakecareofalostpet.donategivehelpkeepplanttakecareof____________________________________(important/moretrees)It'simportanttoplantmoretrees.donategivehelpkeepplanttakecareof___________________________________(necessary/parks/clean)It'snecessarytokeepparksclean.donategivehelpkeepplanttakecareofTryyourbest1.学好英语是重要的。_________________________________2.向老师问好是有礼貌的。_________________________________3.让水龙头一直开着是错误的。_________________________________4.在图书馆里保持安静是有必要的。_________________________________5.吃蔬菜是健康的。_________________________________ItisimportanttolearnEnglishwell.Itispolitetosayhellototeachers.Itiswrongtoleavethetaprunning.Itisnecessarytokeepquietinthelibrary.Itishealthytoeatvegetables.Itis+adj.+todosth.做某事是.......It’smeaningfulforstudentstodosomethingforpeoplewhoneedhelp.对学生们来说为需要帮助的人做些事情很有意义。It’sgreatforustoworkcloselywiththesespecialathletes.Itisadjectiveforsomeoneto-infinitiveItisimportantforpeopletolearngoodmanners.difficultLiHaitowinthecompetition.possiblehertoworkforthecharityonSaturday.for引出逻辑主语Wecanusethepatterntospecifywhowe’retalkingabout.Itis+adj.+forsb+todosth.“意思是：对某人来说，做某事是......”=Doing/Todosth.is+adj.forsb.=Itis+adj.+that从句e.g.ItisimportantforustolearnEnglishwell.=Tolearn/LearningEnglishwellisimportantforus.=ItisimportantthatwelearnEnglishwell.常用的形容词有important,necessary,possible,difficult,easy,interesting,helpful...等，这里的形容词是对所做事情的好坏的性质的说明、修饰。Changthesentences1.HelearnsEnglishwell.Itisveryimportant.___________________________________________2.LiHaitakespartintheSpecialOlympicsGames.Itiswonderful.____________________________________________________________________________3.Wehelppeopleinneed.Itisnecessary._______________________________________4.Wewritetothelocalgoverment.Itisuseful._______________________________________5.Youcan’tplaywithfire.It’sdangerous._______...