It will be very difficult to tell if a guy or girl likes you.
If you pay close attention though, a guy who is into you will start complimenting you a little more, he will talk to you more openly and crack jokes way more often around you. If you ever happen to be around them when they are laughing, if they glance in your direction, they most likely have a crush on you. They will also laugh at all of your jokes, even the ones that you or even they themselves don't find really funny.
A girl who is into you will find their way to be around you and close to you when they can, and you will notice them hanging around you more often. The laughing test might not work as well for them, but it is usually a good indicator as well. Generally, they will find more reasons to hang out with the person they want to be with, and might even be upset when a chance gets taken away from them. This might not be the case with boys, however, because most don't really want to be seen as emotional.
hope i helped on your paper