1) Can you swim? (да) Yes, I can. I can swim.
2) Do you like chess? (да) Yes, I do. I like chess.
3) Is your friend funny and brave? (да) Yes, he(she) is. She(he) is funny and brave.
4) Have you got a dog?(нет) No, I haven't. I haven't got a dog.
5) Can your friend play chess?(нет) No, he(she)cannot. My friend can't play chess.
6) Would you like to eat some sweets? (да) Yes, I would. I'd like to eat some sweets.