按括号内要求转换下列句子。

1. I believe that Lucy can perform a play for the old people.(改为否定句)

2. They will find it somewhere. (改为一般疑问句)

3. The boy asked Mary, "Do you like the art of tea-making?"(改为复合句)

4. We use the battery-operated slippers for seeing in the dark.(改为被动语态)  

5. This book is Li Ping's.(改为同义句)