How do I make him talk more? Please help, easy 10 points!?

I have the same problem with this guy,we're both the same age as you,too (lol). What I usually do is try to think of topics we can talk about that he HAS to give some answer to (a longer one). Maybe he can't think of anything to say,and yes...it's annoying. I think you should think of topics to say and then think of the possible answers and make they can't be "idk" or "ya" or anything else he does. If that doesn't work,tell him how you want to make more convo with him and tell him about the "ya","idk" thing. If it comes down to it...ask him questions about himself lol. I hope one of these choices work! :)