“My job is a teacher”"为什么是错的？在我们的观念里，“工作”和“职业”的名称是一种对应。
但是在英语的观念里是不一样的，工作是指你职责的内容，而“职业”是你的身份，这两者并不是同一个范畴。
Think of it like this. (可以这样想)
A teacher is a person who teaches. (Teacher是指那个教书的人。)
A job is something a person does. (Job是指一个人做的事情。)
"My job is a teacher" is incorrect because a job isn't a person who teaches: YOU are the teacher. ( “My job is a teacher”是不正确的，因为工作并不是一个教书的人：而你是那个教书的人。)
You can say "I am a..." to introduce your position, and "My job is to..." to introduce your responsibilities. (你可以用“I am a...”来介绍你的职位，或者"My job is to..." 来介绍你的工作内容。)
"My job is to treat patients. I am a doctor."
我的工作是治疗病人。我是医生。
"His job is to teach teenagers. He is a High School teacher."
他的工作是教育青少年。他是一位中学老师。
"Their job is to sell houses. They are Estate Agents."
他们的工作是卖房子。他们是房地产经纪人。
