You， Mark or Sally, have just heard that your best friend, Andrew, is spending a lot of time in Net bars playing computer games. You are worried that this will affect his grades. Write a note to him, showing your concern and suggesting that he change his behaviour.
Dear Andrew, I heard on the grapevine that you have been spending a lot of time on computer games in Net bars. Not that there is anything wrong with computer games per se, but I think everything should be moderation. Maybe you should study a bit more since after all that is the ultimate duty of a student. Please do not be mad about my suggestions. I am merely concerned about your grades. And I hate to see a good friend's academic performance being adversely affected by computer games. Mark