Yes

Antonyms of yes:
no, nay, no way, scarcely.
Examples of usage:
  1. " Oh yes, I can, because-" " Because what?"
    "Put Yourself in His Place", Charles Reade.
  2. " Oh yes, she did," said Raby.
    "Put Yourself in His Place", Charles Reade.
  3. Oh yes, I do, I do!
    "Delia Blanchflower", Mrs. Humphry Ward.