In the movie " I am legend " it shows flashback, because it reflects back to the events that happened before he it lead to him being where he is at the moment. It showed us the situation that he had been put through.
In the movie " Matilda" it also shows flashback because Matilda's teacher was remembering how her days were back when she used to live in that house with her parents before they died, and how it was when her aunt took custody over her.
In the movie " freedom riders" it shows flashback when the girl has to go testify she remembers exactly what happened that night that Paco shot the other guy. She knew what she had to do.
In the present he found a woman and her child, so they all decided that what was the best for them was to leave New York and go find somewhere else to live and look for more survivors.
In the present Matilda's teacher requested an adoption for her and she got custody of her so now Matilda will he living happly with her.
In the present in " freedom riders" the students larned how to love each other and learned that they all have gone through something similar, they also learned to get a long with other races.