2. sweet on someone= fond of someone喜欢某人;

　　3. have a sweet tooth 喜欢吃甜食;

　　4. lay/put some sweet lines on someone对某人甜言蜜语、说好话讨好某人;

　　5. short and sweet 简洁明了;

　　6. sweet-talk sb into doing花言巧语说服某人做...