{"solution": "The correct order of the words to form a question is: Did you visit your grandparents last summer?", "explanation": "Explanation: To form a question in English using 'Did', we typically follow this structure:\( \)1. **Did**: The auxiliary verb to start the question.\( \)2. **You**: The subject of the question.\( \)3. **Visit**: The main verb.\( \)4. **Your**: Possessive pronoun.\( \)5. **Grandparents**: Who are being visited.\( \)6. **Last Summer**: When the visit occurred.\( Therefore\), the correct order is: Did you visit your grandparents last summer?"}