At the moment, it's "I'm just..."

I say "I'll be with you in a second, I'm just on the loo." "I'm just cooking dinner right now." "You get snakes and ladders out and I'll just put the washing on then come to play."

DS says "I just going into the kitchen" "I just drinking my drink" and "I just making a mess".

I get to nursery and DS's best mate comes out with "I just eating all the different breakfasts" (they have a choice of four cereals, he had all four in his bowl this morning).