Student or Learner
According to a grammar book key, 'I'll do it until Friday' is grammatically incorrect in the following:
A: Have you done your homework yet?
B: No, but I'll do it until Friday.
I think B is correct, though 'finish' might be better to use. Am I right?
Thanks a lot.
B: No, but I'll do it by or before Friday. You can't use 'until' in that way.
You could say 'I won't do it until Friday'.