(1a) Suppose that you are talking to a group of people. You say, "Please put your backpacks on your backs. Don't carry them in your hands."
(1b) Suppose that you are talking to a group of people. You say, "Please put your backpack on your back. Don't carry it in your hand."
Which one is correct: singular or plural? Thank you.
(1b) Suppose that you are talking to a group of people. You say, "Please put your backpack on your back. Don't carry it in your hand."
Which one is correct: singular or plural? Thank you.