Yes.
Yes.
Yes.
The only limit is common sense and the DM's adjudication. Making a long monologue, for instance, should probably be ruled as more than a free action for instance. Same as taking too many free actions in a turn.
I had one player have twelve free actions in a turn and then bitch at me that I was being unfair for making him HTFU. So it's really down to your group and your play style as to how many you can get away with.