The expressions they use might whom they are speaking to or how well they know each other.
This box is __________ than that one.
—__________ do you go to the cinema? —Once a month.
Be quick, __________ you’ll be late for school.
—Hi, Mike, I’ve got a present __________ you. —Oh, it’s really beautiful. Thank you very much.
The girl is at school. __________ is busy with her work.