Reflective sentences don't simply describe a movie, a book, a world event, etc. They tell the reader:
What you think
Example: The movie really helped me understand what it's like to be a doctor.
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How you felt
Example 1: My heart was pounding in fear when I read the scene with the electroshock therapy. It was awful that they did that to people.
Example 2: I was shocked to learn that Mr. Singer was blind, too. How could he have fooled people for so long. That totally surprised me.
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What you'd do if you were there
Example: If I were the judge, I would have sent Barnard to prison for 20 years, not let him off with a warning.
What you think will happen
Example: This relationship between Anna and Mike can't last. Susan is bound to find out about it and then, watch out!
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How the movie/book/story relates to your life
Example: The scene with the cat and the mouse grabbed my attention, because I lost a cat, too, and my cat loved to chase mice just like the cat in the story.
Anything else that comes into your mind
Example: This chapter reminded me of the scene in A Raisin in the Sun, when the mother finally receives the $10,000 check in the mail.