I am a teacher 如何变为否定句

I am a teacher 如何变为否定句 I am a teacher 变为否定句 I am a middle school student.变为否定句. Im a doctor,I am tall变为否定句 I am a teacher 变为一般疑问句 i am your teacher 改为否定句 I am a teacher的否定形式 英语 I am a teacher 改为否定句 一般疑问句 肯定和否定的回答 如何把I am a nurse改成否定句 将I am from China变为否定句 His teacher has a red car.（变为否定句） his teacher has a red car （变为否定句）