Please writing your comments in English so everyone could understand what you are talking about.Thanks
"a" vs "the" dept.: I was surprised they accept both. "A" would imply all the time whereas "the" would imply the game being watched. What if only one part was asked, "Is he a/the player?" When would "một" be required. Clarification of this would be most helpful in a beginning Tip and Note when we get around to beefing them up.