What is the difference between the use of "who" in the first half of the sentence and who in the second half?
Answer from a Native speaker
Good question! The first "who" refers to which or what person, and can be read "the person that." The second "who" introduces a clause to give more information on a person. Ex: I don't know who told me the coffee shop is open on a Monday. = I don't know the person that told me the coffee shop is open on a Monday. Ex: I already know who the new president is. => gives more information
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