be动词变否定句

含Be动词的陈述句变否定句方法：在be动词(am,is,are)后加notisnot=isn’tarenot=aren’t1.Heisaboy._______________________________________________2.Iknowtheyarestudents._______________________________________________3.Mysisterisabeatifulgirl._______________________________________________4.Mymotherisanurse._______________________________________________5.Theyareintheclassroom._______________________________________________6.Therearesomebooksonthedesk._______________________________________________7.ThisistheflagofAuetralia._______________________________________________8.It’stheU.K.!_______________________________________________9.ThisisamapoftheU.S.______________________________________________10.MyuncleZhiweiisaworker.______________________________________________11.Iamaworker.______________________________________________