IamwatchingTVWhatishedoing？“ing”的来历writetakeliedieswimsitgetrun主语+be+not+v.ing.Be+主语+v.ing?What+be+主语+v.ing？Thebirdsaresingingasong.Theyaredancing.Thecatisplayingtheguitar.Sheisdrawing.drawapictureofmydogThedogisdrivingacar.Theyarehavingtheexam.Heissleeping.Sheisdoingherhomework.Heissurfing.surftheinternetHeisdrinkingcoca-cola.Heisridingabike.Sheistalkingonthephone.TheyarewatchingTV.Sheislookingoutofthewindow.Heiscleaningthefloor.Theyareplayingthecards.Theboyisswimminginthepool.Theyarefighting.fightExercises:看图完成句子用所给词的正确形式填空:We__________(get)readyforthemiddle—termexamthesedays.2.Heoften________(watch)intheday.3.Theearth_________(travel)aroundthesun.4.Thedog_________(run)afteracatnow.5.Listen!Who________(sing)intheroom?6.I________(practice)Englisheveryday.7.It’s10:00am.Chris__________(teach)students.DearBob,Hereisaphotoofmyfamily.Inthisphoto,I’mdoingmyhomework.Myfatheris___________.Mygrandfatheris___________________.Mygrandmotheris________tomymother.Andmysisteris___________________DearLinda,Thanksforyourletterandthephotos.Herearesomeofmyphotos.Inthefirstphoto,I'mplayingbasketballatschool.Inthesecondphoto,I’mswimmingatthepool.Inthenextphoto,youcanseemyfamilyathome.We’reeatingdinner.Inthelastphoto,I’mwithmysister,Gina.She’sdoingherhomework.Exercises