Tell the difference between a story's theme (an objective claim about life the story supports) and a personal opinion or reaction to it, using evidence from the text.
A theme is not "I liked this story" or "I feel bad for the main character." Those are opinions -- true statements about YOU, but not about the story itself. A theme is a claim about life or human nature that the story as a whole supports, one that would stay true even for a reader who disliked the ending. Two readers can disagree completely about whether they enjoyed a story and still agree on its theme.
To find a theme without slipping into opinion, ask two separate questions. First: what does the story actually show happening, start to finish? Second: what does that pattern of events suggest is true about people or choices? The answer to the second question, written as a full sentence, is close to the theme. If your sentence starts with "I think the character should have," you have written an opinion about the character's choices, not a theme about the story.
Mastery looks like: They can state a story's theme as an objective sentence about life, separate from any personal opinion about the characters or the ending.
Common stumbles: Writing a review of the story ("it was sad" or "the characters were annoying") and calling that the theme, instead of a claim the story supports.
See it visually
Interactive, spoken-aloud tools that show this idea in motion.