OK, continuing #1: grabbing.

If A grabs B (you) around the arm or wrist, you twist your wrist, grab A's, then pull A into your knee or a headbutt. Then, pull A's arm around behind their back "chicken-arming" them. don't pull too high unless you want to break their arm. To finish, place your knee or foot on their back, then give a hard shove. This should send them sprawling especially if you hold their arm until they are about to hit the ground. 
see ya next time!