代词it的用法归纳.ppt

代词it的用法归纳一虚词（第1-6项）二形式主语（第7项共十一种句型）三形式宾语（第8项）四强调主语（第9项）Thisisnotmybook.ItisJim’s.___________________________________1、指代前面提到过的事物。---What’sthis?---It’sapencil.---What’sthat?---It’sapicture._______________________________________2、代替指示代词this或thatSomeoneisknockingatthedoor.Pleasegoandseewhoitis.Itisalovelybaby.________________________________________3、指婴儿或不明身份的人表示时间或季节--What’sthetimenow?---It’steno’clock.______________________________________--What’stheweatherliketoday?--It’sfine.______________________________________5、表示天气01Howfarisitfromyourschooltoyourhome?_______________________________________6、表示距离027、用作形式主语，常用于下列11种句型中_____________________________________(1).It+be+adj.+ofsb.todosth.常用的adj:kind/good/wrong/foolish......“某人做某事是......的=Sb.+be+adj.+todosth.Itssillyoftheboytofeedthecatwithacarrot.=Theboyissillytofeedthecatwithacarrot.那个男孩用胡萝卜喂猫真是太傻了。Itisgenerousofyoutohelpthosepoorkidsinthemountians.你帮助山里的穷孩子真是太慷慨了。=Youaregeneroustohelpthepoorkidsinthemountians._____________________________________(2).It+be+adj.+(forsb.)todosth.常用的adj:important/difficult/easy/commom...(对某人来说，)做某事是……=Todosth.+be+adj.(forsb.)ItsimpossibleforSimontoswimacrosstheriver.对西蒙来说，游过那条河是不可能的。=ToswimacrosstheriverisimpossibleforSimon.ItispossibletogohikingontheGreatWallinsomeotherplaces.=TogohikingontheGreatWallinsomeotherplacesispossible.Note:ItisalsogreatfunwalkingandcyclinginGuilin.=WalkingandcyclinginGuilinisalsogreatfun.动名词doing和不定式todo的区别动名词只表示常见性的动作；如果表示具体的或特定的或有待于实现的动作用不定式。Paintingisanart.TopaintthefenceisdifficultforJimmy.=ItisdifficultforJimmytopaintthefence.(3).It+be+nouse/nogood/nofun/(awasteoftime)