How does a guy show he likes a girl in a non verbal way?

I really need to know a shy boy flirts with a girl!

H E L P !How does a guy show he likes a girl in a non verbal way?
He tries to make eyes contact a lot. And you will catch him looking at you :)How does a guy show he likes a girl in a non verbal way?
shy guy like me dont approach direct... but if a shy guy like you he wont tell you but he will show you bit by bit ... now help me on this thanks http://answers.yahoo.com/question/index?qid=20090914013932AAZJzl8