大家都是朋友，不必这么客气。

Dàjiā dōu shì péngyou, bùbì zhème kèqi.

We’re all friends; there’s no need to be so polite.

小问题，你不必太在意。

Xiǎo wèntí, nǐ búbì tài zàiyì.

It’s a small problem; you don’t need to care too much.

这件事已经解决了，你们不必再讨论。

Zhè jiàn shì yǐjīng jiějué le, nǐmen búbì zài tǎolùn.

This matter has been solved; you don’t need to discuss it anymore.