Greeting - Head nodding, smile, hand shaking. The Chinese seldom kiss on the cheek when they meet. Hug is for really close friends or relatives.

Come here - Hand extended toward person, open palm, palm down, with all fingers crooked in a beckoning motion.

Good idea / You've done a great job -Thumb up, the other four fingers hold a fist.

Respect - Using both hands (when one would be enough) in offering something to a visitor or another person. You can even hold your teacup with two hands while someone else fills it with tea to show extra appreciation. When somebody pours tea for you, tap the table to show "thank you."

Thank you for your help- Cupping one fist with the other hand before the chest.

Shame on you- forefinger of one hand extended, tip touches one’s own face several times quickly; similar to scratching, but with the forefinger straight.

I'm full - Patting stomachs. The Chinese never lay their hands on their necks when they are full, which is a suicide action to Chinese.

Are you insane? - Touch temple. Americans often use it to express somebody’s cleverness. But it means there is something wrong with one’s mind or one is stupid to Chinese.

The Chinese think it rude to point at somebody with one finger. When you introduce someone, point at him/her with all of your five fingers of one hand, which also means "please".

Girls will hold hands or walk arm-in-arm in China. It doesn't mean they are lesbians.