Quiz: Flag down, play on, or whistle?

For each one, answer flag down, play-on, or immediate whistle (more than one action may be appropriate):
(1) The ball is loose. A1 pushes B1 in the back.
(2) The ball is in possession by A1. A2 slashes B1.
(3) The ball is loose. A1 slashes B1.
(4) The ball is in possession of A1. B1 goes offsides.
(5) The ball is in possession of A1. A2 goes offsides.
(6) The ball is in possession of A1. B1 illegally bodychecks A2.
Note: this is intended for novices. If these all have obvious answers to you, hold off for a day or so.
(1) The ball is loose. A1 pushes B1 in the back.
(2) The ball is in possession by A1. A2 slashes B1.
(3) The ball is loose. A1 slashes B1.
(4) The ball is in possession of A1. B1 goes offsides.
(5) The ball is in possession of A1. A2 goes offsides.
(6) The ball is in possession of A1. B1 illegally bodychecks A2.
Note: this is intended for novices. If these all have obvious answers to you, hold off for a day or so.