How will you know if a guy likes you?

It depends on the guy but if he's shy he'll do the following (I should know, I'm a shy guy) 1. You'll see him staring at you even and he'll look away when you turn towards him. 2. He'll try to get noticed when he's in a crowd. 3. He might have trouble making conversation. 4. When he talks to you he'll smile and look deep into your eyes. 5. His voice will get softer. 6. His eyes might get slightly wider. 7. He'll sit up straighter when you walk into the room he's in.