Mainly using i and me in a sentence identifies that the story is in third person.
EDIT: sorry wasn't thinking straight, so third person is you or the narrator seeing/feeling/visualizing the character that is in play. just imagine as if you are stalking that person like a ghost! and you see everything they do and feel, emotionally of course. its just like watching a movie you're the third person.
In third person limited the narrator only knows the thoughts and feelings of one character. All characters are described using pronouns, such as 'they', 'he', and 'she'.
The third-person omniscient point of view is a method of storytelling in which the narrator knows the thoughts and feelings of all of the characters in the story.
Hope this helped.
