What would be considered a minimal amount of dialogue to advance the story in a film?

A complete sentence serves as a minimal yet effective way to convey information and advance the story in a film. A single complete sentence can provide context, establish character relationships, or introduce a plot point, thereby significantly contributing to the narrative. This level of dialogue allows for clarity and engagement without overwhelming the audience with excessive information.

While a single word or a mere phrase may suggest an idea or emotion, they may lack the depth and context needed to meaningfully further the plot. Additionally, dialogue involving two characters can enhance interaction and development but requires more than just a minimal amount, as it typically involves back-and-forth exchanges that might be more complex than necessary for advancing the story at a fundamental level. A complete sentence strikes the right balance, offering enough substance for storytelling while remaining concise.