This can be taken to extremes and the biggest extreme is the case of actors, which is if there's ever a case-- Anybody know who this is, the actor?

这个理论最极端的例子,就发生在演员身上，如果要举个例子…,大家知道这个演员是谁吗？

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Wanting to be an actress, who's your favorite movie star?

想当演员？你最喜欢的电影明星是谁？

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Who do you think is the best looking actress?

你觉得谁是最漂亮的女演员？

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Who is your favorite actress?

你最喜欢的女演员是谁？

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Or you could use the "who" question to find out who somebody's favorite actor or actress is.

又或者你可以用“who”问句来了解其他人最欣赏的男女演员是谁。

Who 课堂 - SpeakingMax英语口语达人