Which sounds better, it or they?
I heard two people shouting outside, so I looked through the window. It was/They were a man and a police officer.
My guess is “It.” But I can’t explain why “they” sounds wrong.
Yes you are right "It" is correct because "It" is used with singular forms while "They" is used with plural forms (like a group of peoples or something else). in your example It was a man and a police officer "It" refers to a man (a single person).
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Yes you are right "It" is correct because "It" is used with singular forms while "They" is used with plural forms (like a group of peoples or something else).
in your example
It was a man and a police officer
"It" refers to a man (a single person).
It refers to the situation happening outside; they would refer only to the two people. So it all really depends on what you want to say.