1. They stand closer to you or they keep a smaller distance when they’re around you. It shows that they are comfortable with you and want to get physically intimate.
2. They are more likely to face you when talking to you as opposed to standing sideways or away from you. However, if they are shy, then maybe this point won’t apply so much. Instead, they will periodically take glimpses at you when you’re not looking.
3. They’d try to get your attention for trivial things such as calling you about what homework they have or when the homework is due.
4. They smile more frequently because of you. Even if they don’t show it while around you because they don’t want you to find out they like you, they will smile when they think of you.