你一定要幫助我們。

You must help us.

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 一定要 yīdìngyào must
3 幫助 bāngzhù
  1. assistance; aid
  2. to help; to assist
4 我們 wǒmen we; us; ourselves; our