Question

Do you know that old man?(作肯定回答)

Do you know that old man?(作肯定回答)

Answer 1

Do you know that old man?
你知道那个老人吗？
Yes,I do.
是的，我知道。

Answer 2

yes,I do
是的，我认识

Answer 3

Yes,I do.

Answer 4

Yes， I do.