示例
A：Are you sure you can come back to dormitory before 10 o'clock?
B：I promise.
A：你确定10点以前回宿舍吗？
B：我保证。
A：I will take good care of myself. I promise.
B：Well, but I am still worried.
A：我会好好照顾自己的，我保证。
B：嗯，我还是不放心。