斟酒前服务员为什么要让主人辨认商标？
参考答案：
主要包括三个意思：①表示对主人的尊敬；②核实选酒有无差错；③证明商品质量可靠。
句型转换。
1. Betty does her homework at night. (改为否定句)
Betty _______ _______ her homework at night
2. My father will get back from Beijing in two days. (对划线部分提问)
_______ _______ _______ your father get back from Beijing?
3. A donut is five yuan. (对划线部分提问)
_______ _______ _______ a donut?
4. Mr Brown asked his friends to have dinner. (改为一般疑问句)
_______ Mr Brown _______ his friends to have dinner?
5. There isn't anybody in the room. (改为同义句)
There _______ _______ in the room.
6. That's a scary movie. (改为感叹句)
_______ _______ _______ movie that is!
构成硬度的物质溶解在水中时，都使水呈碱性。（）
