不该

nǐ bù gāi wèi jīng yǔn xǔ sī zì zhàn yǒu tā rén zhī wù

你不该未经允许私自占有他人之物。

You should not appropriate other people's belongings without their permission.

wǒ men bù gāi zài bèi hòu jiǎng bié rén de huài huà

我们不该在背后讲别人的坏话。

We should not speak ill of a man behind his back.

wéi guò qù de bù gāi shú zuì

为过去的不该赎罪

atone for past mistakes