I mean… You can but all of those are pretty suboptimal lines of play since most class feats are built around using multiple actions to do more than you’d be able to do with the same number of individual actions.
Don’t get me wrong, I think PF2’s action economy is brilliant. But I do wish that taking an action before you’ve moved your full speed didn’t cause you to lose any remaining movement. If I have 20 foot speed, I should be able to move 10 feet, attack, and move 10 more feet without having to use a third action.