用法：
promise sth to sb 答应某事对某人
promise sb sth 答应某人某事
promise to do sth 答应做某事
make a promise 许诺
keep a promise 遵守诺言
promise例句
The post office has promised to resume first class mail delivery to the area on Friday
邮局承诺于星期五恢复对这个地区第一类邮件的.递送。
In 1920 the great powers promised them an independent state
1920年，列强承诺让他们成为一个独立的国家。
If you make a promise, you should keep it
如果做出了承诺，就应该遵守。