变一般疑问句 .否定句.否定回答.肯定回答
I‘m a doctor.
依次为：Are you a doctor？I'm not a doctor. Yes,I am. No,I'm not.
You are a student.
依次为：Are you a student? You are not a student. Yes,I am. No,I'm not.
It is my ruler.
Is it your ruler？It isn't my ruler. Yes，it is. No, it isn't.
希望对你有帮助！
are you a doctor? yes,i am. no,i am not.
i am not a doctor.
are you a student? i am not a student
is it your ruler? yes,it is mine.no,it is not mine.
it is not my ruler.
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