promise

I promise that I will return your book by the end of the week.

(Chinese) 我保证本周末前把书还给你。

The government promised to reduce taxes for small business owners.

(Chinese) 政府承诺为小企业主减税。

She was deeply hurt when her best friend broke a serious promise.

(Chinese) 当她最好的朋友违背了一个严肃的诺言时，她深受伤害。

Always think carefully before you make a promise you might not be able to keep.

(Chinese) 在许下可能无法实现的诺言前，一定要三思。