句型转换。
1. Have you packed the beach towels yet?(作否定回答）
_______ , _______ _______.
2. Mary has already cleaned the room. (改为一般疑问句)
Mary_______ the room_______?
3. He came here three days ago.(改为同义句)
He has _______here _______three days.
4. I left Beijing three months ago.(改为同义句)
Bei Jing_______three months.
5. I have lived in Shanghai since l was born.(对画线部分提问)
_______ _______have you lived in Shanghai?
