疑問句:do you know?

你兩方式都是對的，但通常都會這樣用的：
Do you know what I am talking about?
(1) Yes, I do
Or
(2) Yes, I know what you are talking about. (加強回答)
Do you like playing badminton?
(1) Yes, I do
or
(2) Yes, I like playing badminton (加強回答)
希望幫到你啦 ^.^
圖片參考：http://tw.yimg.com/i/tw/ugc/rte/smiley_39.gif

Do you know.......?
最好係答,Yes, I do. 或者, Yes, I see.
通常用do來開首做問句的,都是是非問句.
eg. Do you like reading? Yes, I do. I like reading.