Weegy: The sentence that uses grammar correctly is: Our oldest dog is quicker than our youngest dog.
User: Which of these sentences uses grammar correctly? My red tabby is the playfulest of my three cats.
My red tabby is the more playful of my three cats.
My red tabby is the most playful of my three cats.
Weegy: The sentence that uses grammar correctly is: My red tabby is the most playful of my three cats.
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