[{"hint": "The subject is who/what the sentence is about. The predicate is everything else.", "answer": "Subject: The old oak tree. Predicate: swayed gently in the wind.", "question": "Identify the subject and predicate in: \"The old oak tree swayed gently in the wind.\""}, {"hint": "Use commas to separate items in a list.", "answer": "\"I need eggs, milk, bread, and butter from the store.\"", "question": "Add commas where needed: \"I need eggs milk bread and butter from the store.\""}]