1) sometimes he is just playing - it's a game for him and he's hold up a pen and say "this is a backpack" and I'll say "really?" and he'll laugh and say "this is a t-shirt" etc etc etc and it is clearly a game for him, so I'm not worried about that situation
2) sometimes he'll look at something red and say "it's yellow" and usually I don't want to totally contradict him so I'll say "yes and yellow too"...in this instance should I flat out correct him and say "no, it's not red, it's yellow" or is my response ok? He does this not just for colors, that's just an example.
3) sometimes when he's playing on his own (near me), he'll start singing (in a little voice) and once I figure out what he's singing, I sometimes say 'Oh, yes..." and then I sing it. Is this too disruptive? Should I let him just stay in his own world with his own thoughts without me interrupting him? Sometimes he looks happy to see me singing but still I'm not sure it's the best thing for me to do. Maybe I should just leave him alone at times like that....?
Thanks for any input on this!