Sorry, there are hundreds if not thousands of myriad combinations of movement and posture and eye dancing and small noises that make up nonverbal social cues. You could read a book on body language - those were quite popular for a while during the 70s - and that would give you a basic starting point, but you just have to pick these things up gradually by experience. For most people, they absorb these things in infancy. For us, it's an arduous, ongoing process - like a detective piecing evidence together one clue at a time, until a clear picture begins to emerge. I've never found a shortcut, and a lot if it is still mysterious and baffling.