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练习：把下列句型改成否定形式1.Iamateach。2.Wehavetwonewfriends.3.Shecanswim.4.They’replayingfootball.5.Shegoestoschoolatseven.6.There’sapeninthepencil-box.7.Ilikereadingbooks.8.Tomisinterestedinsinging..9.Mysistercandance.10.Shelikesapples.11.Marysingsverywell.12.Thisishisbook.13.Wecallitajoey.14.IgototheparkonSundays.15.Herbrothercanplaybasketball.16.Therearesomebooksonthedesk.17.TodayisSunday.18.Myorangesareorange.19.Heiseleven.20.LiYanhasalittledoll.