Player Out of Bounds/1st to touch inbounds

[mutantducky]

quick clarification on this-1. A1 in control holding the ball, fumbles it and saves it out of bounds. Can A1 go back in grab ball? If dribble is that a violation?
2.A1 is dribbling and losses the ball, his foot and then saves it. Once back in bounds can he pick it up. I assume can't dribble.
3. A1 dribbles of A2 foot- does that change anything?
4. A1 is dribbling and goes out of bounds for a reason without touching the ball, say other players had tripped and A1 goes out of avoid a collision. Can A1 once inbounds continue the dribble? If he grabs it and then dribbles is that a violation?
thanks

I'm glad I got that stupid no two feet thing. I've had that during pickup games and even before I was a ref I was "THIS isn't football"