疑问句：
What kind of work do you do ? 你是做什么工作的?
Could you let me know what your job is? 能让我知道你是做什么的吗?
陈述句：
I don't know what you do/ I don't know what your job is. 我不知道你是做什么的.
Please let me know what your job is. 请告知你的工作是什么.
Please tell me what you do. 请告诉我你是做什么的.