Hello. Thank you, Ms.Sue, again for the answer. Please help me with one more question. Is the sentence OK: "While I'm making coffee, you'll be cutting the cake"? (it's a kind of arrangement)
By the way, do I have to use "some coffee" in this context?
Thank you a lot.
Your sentence is correct. You could say "some" coffee, but it's not necessary.
posted by Ms. Sue