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?