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1 含 Be 动词的陈述句变否定句 方法：在 be 动词(am,is,are)后加 not is not=isnt are not=arent 1.He is a boy._ 2.I know they are students._ 3.My sister is a beatiful girl._ 4.My mother is a nurse._ 5.They are in the classroom._ 6.There are some books on the desk._ 7.This is the flag of Auetralia._ 8.Its the.!_ 9.This is a map of the.2 _ 10.My uncle Zhiwei is a worker._ 11.I am a worker._