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最佳答案：1.I am not a doctor.are you a doctor?yes I am .No,I'm not.2.he isn't a teacher.I
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最佳答案：Is there a mini-library in your classroom?Yes,there is.No,there isn't.
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最佳答案：ARE you a teacher?yes i am no i am not is it a red flag?yes it is no it isn't is
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最佳答案：保证准确率!1.There is a rubber in the pencil case.否定句：There isn't a rubber in the pen