A1 used especially in questions as the subject or object of a verb, when asking which person or people, or when asking what someone's name is谁,什么人
used with verbs that relate to knowing, when you want to say that something is not known(与表示“知道”的动词连用,表示不知道)
More examples
Who told you you could park there?
Who have you invited to the party?
Who won the match?
Who did you vote for in the last election?
Who is the president of France?
A2 used as the subject or object of a verb to show which person you are referring to, or to add information about a person just mentioned. It is used for people, not things(用作动词的主语或宾语,表示所提及的人,或附加所提及的人的信息)
More examples
We need a mayor who is tough enough to clean up this town.
There seems to be some confusion over who is actually giving the talk.
She's part of a team of scientists who are engaged on/upon cancer research.
Have the police got the man who did it yet?
People who work in the trade can buy their books at a discount.
abbreviation forthe World Health Organization 世界卫生组织(the World Health Organization的缩写)
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