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-含Be 动词的陈述句变否定句方法：在be动词(am ,is, are )后加notis not=isnt are not= arent1. 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 U.K.! _ 9. This is a map of the U.S. _ 10. My uncle Zhiwei is a worker. _11. I am a worker. _ 第 3 页-