under. Should you say “He’s below 21 years old” or “He’s under 21 years old”? Are there situations where you can use both prepositions with no difference in meaning? The answer to the second question is YES, but there are situations where you must choose one or the other. To learn more about the similarities and differences between
under, watch the video, then do the quiz to check your understanding. I hope your score won’t be below average!