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CoincidenceYou will be observed by who?
CoincidenceWho will you be observed by?They are both OK. Some would prefer 'whom' in the first
CoincidenceYou will be observed by who?I guess that this sentence is only acceptable in spoken language, isn't it?From grammatical point of view, it is not a proper question...You would be more likely to see 'whom' in the written form.