你是做什么的介绍：

what do you do，
你是做什么的
Hello!What do you do?
Hello!I am a policeman.
Oh, policeman.
Can you give me a hand,please?
Yes! Of course!
Hello!What do you do?
I am a driver.
Can you give me a hand,please?
Yes! Of course!
Hi,who are you?What do you do?
Don’t worry，I am a doctor.
Don’t worry，he is a doctor.
Who are you?What are you going to do?
Don’t worry，I am a nurse.
Don’t worry，she is a nurse.