按要求改写下列句子。 1. Sandy has long hair in a ponytail. (改为一般疑问句并作肯定回答) — _____________ Sandy _____________ long hair in a ponytail? — Yes, _____________ _____________. 2. We went to school on foot yesterday morning. (改为否定句) We _____________ _____________ to school on foot yesterday morning. 3. She is helping the twins now. (改为一般疑问句并作否定回答) — _____________ she helping the twins now? — No, _____________ _____________. 4. John comes from Canada . (对画线部分提问) Where _____________ John _____________ from? 5. I am going to walk my dog after supper. (对画线部分提问) What _____________ you _____________ _____________ _____________ after supper?