Can you ask a toddler to be quiet?

[MummyNaomi]

My DS is a chatterbox at the moment, and will repeat things over and over and I've recently discovered that if I repeat back to him what he is saying before I answer, he seems to 'get' that I have answered him, probably sounds a bit silly, but it seems to work.
Sometimes he will chatter away when DH and I are mid conversation, and frankly sometimes we just need to stop and acknowledge him and then we tell him its our turn (to talk), sometimes it works, sometimes it doesn't, at 2.5 he doesn't completely get it yet.
If he is being particularly rowdy, another successful tactic is to talk to him in whispers and he'll mimic - very handy sometimes (eg when waiting in doctors surgery etc).
Best advice I reckon is that sometimes it is more effective just to pause the adult conversation and respond to the toddler, as they are persistent little people and they will outlast us heheheheheheheehe, I figure like everything, they will eventually understand more about waiting till someones finished talking etc