who在宾语从句中作主语
whom在宾语从句中作动词宾语或者介词宾语
例句：
1. We wonder who is going to answer for the action?
我们不知道谁对这个行为负责。
2. She asked me who had taken away the umbrella by mistake.
她问我谁错拿了雨伞？
3. Father wanted to know whom his son lived with.父亲想知道儿子和谁一起住。
4. I asked the boss with whom I was going to work.
我问老板我将和谁一起工作。
