Nobody knows for sure.
If you don't know you like a guy, it means that you just don't like him or you just friends. If you like him you should know.
This is a tongue twister. And no.
nothing! they maybe know that the guy you like likes you back!
Get to know him.
It is ok to like a guy after you know he likes you. That is perfectly normal and a part of life.
do you mean how do GUYS tease their mates if they like a guy? As in, try to get the guy they like to know they like them? Or make fun of them because they like a guy? be specific.
Try to make him know that you are not a guy but a girl :)
Ask them...
If he says i like you
ask him
you tell him
maybe he like ya and he wanna know if you like him