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Is "Based on a true story" a grammatically correct sentence if it was at the end of a paragraph discussing a story? I view this as a proper sentence with an implied subject and as grammatically sound. Is there a good way to explain this if this is correct?

Told I had bad grammar
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  • With an implied subject it's valid. – Hot Licks Jan 15 '20 at 03:05
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    This sounds like the kind of Conversational Deletion that's been idiomatized in advertising, especially for movies and TV dramas. So it would be short for (This movie is) based on a true story. Though what "true story" means, in the context of another story that's only "based on" it, is a good exercise for mental muscles. – John Lawler Jan 15 '20 at 03:42

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