#1 is formal; #2 is informal.
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AnonymousHI,Which of the following scentences is correct and why??1) Whom do I Know?2) Who do I Know?The first, strictly speaking, though the objective form is rarely used when who is the first word in a sentence. It's probably up there with using the proper nominative form in simple copulae constructions, e.g., "It is I," "That is she." In other words