When your leg is caught there are several things you can do:

1. Turn and face away from opponent, bend knee and turn knee to face down. Pull your leg away or hop and pull away. Very basic.

2. First get you foot or leg to his outside (not inbetween his legs). Now bend your leg and move close, then hop up and land on your opponents hip (with your shin sorta straddling his hip). This is called Absorbing (吸). Now grab your arm aroung his neck and prepare to straighten your leg when he sets you back down. When you reach the ground be prepared for any number of counter throws.

3. Put your "caught" foot inbetween his legs and grab his arm with one hand and his head with the other. Turn and look away from opponent and Leg Blocking throw him.

ginosifu

ps I'll think of some more later...