180 degree Rule
This rule is a basic guideline in film making that states the two people in the scene should always have the same left or right relationship to each other. There is an imaginary axis which connects the two characters. It is used in nearly every film made.
http://www.youtube.com/watch?v=HdyyuqmCW14
Match on action
It is also known as cutting on action. It is where the editor of the film cuts from one shot to another view that matches the first shot actions. The effect of the this is the two shots can be taken hours apart but put together to make it look as if they were filmed at the same time.
Example:
http://www.youtube.com/watch?v=laUPi7MPOSQ&NR=1
Shot reverse shot
This is a film technique used where once character is shown looking at another character and then another character is shown looking back at the first character, this makes the viewers assume the characters are together.
http://www.youtube.com/watch?v=Co0ShBwEj0s&feature=related
