The 180° rule is a basic guideline in film making that states that two characters (or other elements) in the same scene should always have the same left/right relationship to each other. If the camera passes over the imaginary axis connecting the two subjects, it is called crossing the line. The new shot, from the opposite side, is known as a reverse angle.
Shot, Reverse Shot:
Shot reverse shot is a film technique where one character is shown looking at another character (often off-screen), and then the other character is shown looking back at the first character. Since the characters are shown facing in opposite directions, the viewer assumes that they are looking at each other.Match-on - Action:
Match - on - Action is a cut in film editing between either two different objects, two different spaces, or two different compositions in which an object in the two shots graphically match, often helping to establish a strong continuity of action and linking the two shots metaphorically.
Example of Match - on - Action: http://www.youtube.com/watch?v=5eCux1id0t4&NR=1
