Match on Action Rule:
This is when you cut from one shot to another view that matches the action and pace of the first shot. His creates the impression of continunity although you may have filmed the shots weeks apart. If the character begins an action in he first shot and completes it in the next, a visual 'bridge' is created which acts to disguise the cut from one to the other.
Shot Reverse Shot:
This is a film technique wherein 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.
The 180° rule:
This 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.
