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You can't convince him. You can tell him and your reasons for thinking he is not a good friend but ultimatly he must make up his mind.
Suggestion: Convince them to do something more fun to them then runescape.
He gives him chocolate
say please
you tell them to join
What arguments would you use to convince a friend that the lives of human beings are dependent on solar energy?
Your friend is going to see what they want to see; so all you can do is try to convince him the best you can. If he doesn't see what you see then you will just have to let him come around to it on his own.
motivate the importance of that particular download
She tried to convince her friend to go to the movie with her by highlighting its great reviews and intriguing plot.
Janette is trying to convince Richard to let her play in the baseball team.
tell them u will pay them or do a chore for them.
Beg them not to and talk to their parents.