你應該信守諾言。

You should keep your promise.

Source: Tatoeba

Sentence Composition

=1 你 nǐ you (informal, as opposed to courteous 您 nín)
=1 你 nǐ you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
2 應該 yīnggāi ought to; should; must
3 信守 xìnshǒu
  1. to abide by
  2. to keep (promises etc)
4 諾言 nuòyán promise