Hello everybody,

I am looking for pronunciation rules regarding the -s ending of the verbs in the 3rd person singular: for example: sees, listens, asks, lives, sleeps, etc I know that there are three ways of pronunciation:
It can be pronunced:

[s].................................................. .......
[z].................................................. .......
[iz] for example: watches, washes.

So, when do we pronunce [s] and when [z]? What is the rule?

Thank you in advance
Madox