Simple grammar check and child-friendly explanation for the sentence about a concrete mixer truck. Shows a corrected sentence, a simpler version, and a short reason why the change helps.
Original sentence: The drum of the concrete mixer truck spins to make strong concrete for building.
Corrected sentence: The concrete mixer truck's drum spins to make strong concrete for building.
Why this is better: Saying "the concrete mixer truck's drum" sounds smoother and shows the drum belongs to the truck. The rest of the sentence is good: the drum spins to mix materials so the concrete becomes strong for building.
Even simpler version (for a 7-year-old): The mixer truck spins to mix strong concrete for building.