It's hard to believe that it was as late as 1979 that a modern screenwriting manual didn't exist until Syd Field came along. (Syd sadley passed away in 2013).  Since then we've seen a proliferation of manuals and experts present their take on proper screenwriting structure and form.  Even if you do not believe in the idea of consciously thinking about story structure as you write, having structure in mind as you conceptualize your story and frankly when you outline (if you outline) is probably something you do subconsciously if not with intention.  

There is no formula to writing, only guidelines and principles perhaps.  Take the following with a grain of salt, but we highly recommend you consider structure at some level in the writing process!

There is no formula to writing, only guidelines and principles perhaps.  Take the following with a grain of salt, but we highly recommend you consider structure at some level in the writing process!