How to talk to a guy?

Okay, so there's this guy I have a MAJOR crush on. We've never talked, but I know that he knows who I am. I don't have any classes with him but I see him in the hallways and at choir concerts, I even volunteer at an elementary school to tutor kids and he's there too. How do I talk to him? What do I say and where/when?? Thanks!
How to talk to a guy?
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