there are two tunes in english, it is up tune and down tune.but the 4 tunes in Chinese.it is flat tune,up tune,turn tune and down tune.i can not say clearly.but you can tell me your email or msn.i send the voice to you.

please don't be afraid to use it, even you will make mistakes,it's normal,even chinese people can not say "i can speak perfect chinese.", so don't worry.(if any mistake in my english, please igore them...)

just take it easy,using wrong tunes do not misunderstand others

I think it doesn't matter. You should listen and speak frequently and talk with Chinese people so that can help your spoken language.

well bad desk bus ba de bu are all 4 tunes