Sometimes I feel the signs but the signs may be wrong...some people are just more outgoing than others for example, I´m a chinese but i´m living in the Europe, in a western country and many people here are outgoing, you think the are sending you signs that they want to be with you but the may not want it but you only think so. I prefer a guy to just tell it straight to me that he likes me. But if i move to HK or something and live there for several years, may opinion may change. I may want the guy to give me some signs. But mostly the girl/guy will be a lot more nervous than usual and show you strange appearence. and they may do things wrong etc.
if they constantly stares at you and you look back and they look away.... through a rock or something at them. if they dont respond... they like you... if they come back and goes WTF on you..... means she totally digs you...