Well it depends on who it is. My best friend is a guy and when we talk, we talk about anything really. Whatever pops up into your mind. I'm having a converation with him right now and we're literally talking about a magic unicorn named Unitub. haha so as you can see, you can talk about anything :)
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you talk about stuff to guys by being your self it may be hard to talk stuff to them cauze there guys but if you tell them how you really fell and how anoying it is then they will listen, trust me i know these things
You could start off with "Hi" or with something surprising like "What question on math are you on?", then you surprise them with a "I'm done!" and they're on only like the 2nd question, they'll or he'll be impressed and maybe talk with you sometimes.
Friends= just school stuff and stuff like that...
You like him but he doesnt like you= just eb your self and try not to blurt out that you like hin
you like him and he likes you but not dating=just things like getting to know each other
dating= talk about how much you love him... but if he doesnt like that then just be cool around him :D good luck
Try keeping it simple - find out her likes and dislikes and talk about possible similar interests you may have. You could also talk about movies, music etc.
Just be your self and tell your true feelings!!! Love is just around the corner.
anything they are ur friends u can tell them anything.boys.movies.gossip.interesting stuff like boys.