Identify a concrete symbol in a text and build it into a one-sentence theme statement that goes beyond the story's literal plot.
A symbol is a concrete object that carries meaning beyond itself. A flag is cloth, but it can stand for a nation. In "The Necklace," the necklace is obviously jewelry, but by the story's end it has come to stand for the gap between appearance and reality -- and for how much Mathilde is willing to sacrifice to close that gap, or thinks she is.
A theme is not a topic ("appearance versus reality") but a full sentence claiming something the story argues about that topic ("the story suggests that chasing the appearance of wealth can cost far more than the thing itself was ever worth"). A one-word topic fits many stories; a real theme statement should only fit this one, because it has to survive contact with the story's specific ending.
Mastery looks like: They can name a concrete symbol, explain what it represents, and write a one-sentence theme statement specific enough to fail for a different story.
Common stumbles: Stopping at a one-word topic and calling it a theme; choosing a theme statement so general it could describe almost any story ever written.
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