Research; Different Types Of Structure Of A Film Opening

Structures of Film Openings are very essential when creating any kind of film.
There are four types of structures to a film opening however they are three basic structures which are:

Discrete Title Sequence

A narrative opening

Credits over a blank screen

Discrete Title Sequence: Discrete title sequences are separately edited sequences that stand apart from the film opening. They are stylised and heavily edited, and they support nearly all of the opening credits and film title.
 An example which shows a Discrete Opening  would be the film The Enemy Of The State (1998) or Arlington Road. Here is the trailer for The Enemy Of The State:

An example which shows a narrative opening would be the panic room. Here is the trailer:

And finally a film opening showing credits over a blank screen is an example from Donnie Darko: