Looks at Stone and goes "pfft"
Some one has to teach, if not.... you never learn.
Good begging has to come from the heart.
Just like real submission.
If it doesnt come from deep inside its just an act and most preceptive dominants (those that arent totally thinking with thier libidos) will quickly see through any "false pretenses".
It really helps if the thing your asking/begging for is something only your dominant can give you and not somthing you can expect to recieve anyway with a demand or take for youself etc at some later time.
My best advise is to start small with any "training" in this department.
Try placing yourself litterally at your dominants mercy in practice a few times.
Before you can teach your mind to be at his mercy during relaxed "play" etc it does help to actually know what its like to really be "there" totally dependent on him.
There are several ways to do this (some more fun than others) like :
One obvious and somewhat extreme way involves breath play, nothing will give you scincere begging like taking your "air" away etc.
Of course this might not be your cup of tea.
The dominat could tie you in a very compromising and perhaps uncomfortable if not painful position and you could practise by begging for release from the position upon the condition that the pain be increased or mery not be granted until you sound sufficintly sincere.
The threat of simular punishments could allways be held over you in those cases when you are not being ernest enough in the future (six wacks to the clitoris for each infraction with a thin crop is very effective from personal experience).
I well remember the first time the "slut get right" stick (lol not kidding thats what I call his cane) was "used" on me but fear of punishment is only one way to teach.
Denial of orgasm is another very effective method.
Lord knows I begged with verve for the chance to cum allmost instictually after the first few times I was taken to the edge of orgasm and held there without release until I had asked appropriately and begged egeraly enough for that special permission.
Of course real from the heart begging cant come easily unless you are really at your dominants mercy.
It isnt enough to sound like your begging well, you have to really truely mean it from the depths of your soul.
Safe words not withstanding (since in my humble opinion they are just a false saftey net) after all when your tied up ass high and face to the floor while someone is tearing up your bottom you can't really make them stop by screaming "red light" or somthing, especially if your gagged. (great way to learn how to beg with body language or your eyes alone btw is to be gagged)
Anyways I hope some of these how too scenerios are helpful damyanti
Just leme know if you need other ideas and good luck huggels