One of the only ones I know...
Ni hao... How are you (but not as a question)
Wei ... Used when you answer the phone.(Wei, ni hao ?)
Bu yao ! ... I don't want (very useful, most of chinese will try to sell you anything)
Wo yao (Wo yao zhe ge) ... I want (I want this)
Bu zhi dao ... I don't know
De, due, hao de ... Yes, ok, good
Shi ... Yes
Bu shi ... No (I say it all the time !!!)
Faguo ... France (yes, taxi drivers always ask me where I'm from.. Wo xie faguo ren !!! )
Xie xie ... Thank you (pronounce she she)
Due bu shi ... I'm sorry (pronounce doue boo tche)
Zai jian ... Good bye
and.. that's all !! But with these few word, and body language, I manage to get what I want... and don't want !