WHO vs. WHOM - What's the Difference? - When to Use Who or Whom

source: Learn English Lab     2016年8月30日
While it's true that 'who' is much more common, there are some situations where you should use 'whom' instead of 'who.' We will explore those situations in this lesson, and also look at common prepositional expressions such as 'by whom,' 'from whom,' 'to whom,' 'with whom' and 'for whom.'
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1)  interrogative pronouns: who, whom, what, which, whose
2) questions with who, whom, what, and whose