Body language signs that he's interested

[ZzeWatermelon]

Wanna know what you think about it.
Everyone has a different opinion.

[kdapik]

-look at you all the times.
-like to sit next to you.
- trying to talk to you

[mrmee]

-takes things like pensils so you have to talk to him to get it back
-looks at you a lot
-tries too hard to look relaxed
-"not understanding" somthing you obviously do
-Shows off in front of you

[Melodic]

Lots of hugs, usually will sit close to you, looks at you a lot, if in conversations with others sometimes his legs will face your direction, will touch you as much as possible.

[James Dean]

Good eye contact, smiling, laughing at you for no reason. You guys lock eyes at the same time either intentional or unintentional.

Relaxed arms and legs. It's easy to tell the vibe when someone likes you or is trying to flirt with you. most of the time.

[Jexer]

As a shy kid who doesn't really talk to any girls whether I want to or not, I usually just get quick glimpses of girls who I think are pretty. I stare sometimes on accident but I don't think I have been caught staring as I look away as soon as I see their head turn.

[ZzeWatermelon]

Yeah, but even though you turn your head, girls notice it :D

[Whiskers]

If the person is confident all of the above but if they are shy they will most likely:
Avoid eye contact
Try to be as near as possible without attempting conversation
Admire from afar
Stare until you look at them then they look away
Smile when they say your name
These are things I do so not all of them might happen with other shy people

[Abhorrence]

It's really difficult to tell because everyone is very different.
Although having immense amounts of eye contact, random touching and smiling every time you look at them is a pretty strong indication they like you. Although, they could just be showing their platonic affection in a way that seems romantic.

[Zachary G]

everyone and every situation is different, so its hard to tell exactly. for me its when they touch you and the touch lasts a little bit longer than it supposed to; when you catch them looking at you and the look away, but look back when you look away; they call you just because -- those are the tell tale signs for me.

[JamesSuperBoy]

varies with everyone - I guess you need more than body language to make the case.
But thats up to you.

[Amy123]

We'll
- stares at you
- shows intrest in you
- tries to touch you ( not in a bad way like a hug )
- if there pupils dilate when they look at you

There are a lot of other signs but these are the main