Let's change the subject.=Let's talk about something else.=Let's talk aboutsomething different.=I'd rather talk about something else.
Let's get back to the subject.=Let's get back to the point.=Let's get backon track.
I don't want to talk about it now.=I'd prefer not to talk about it.
Let's talk about it later.
To change the subject...
Well, all joking aside,...=Well, seriously,...
By the way,...
You were saying?
Continue.=Carry on.=Please go on.
That reminds me.
Let's stop talking.=I'm tired of talking. =I don't want to talkanymore.
I've heard the story before. =You've already told me.
Let's drop the subject. =Let's drop it.=I don't want to talk about itanymore.