大可不必

nǐ dà kě bù bì wèi zhè cì kǎo shì nà me pīn mìng

你大可不必为这次考试那么拼命。

You didn't really have to extend yourself in the exam.

duì yú zhè yàng de shuō fa dà kě bù bì wán quán xiāng xìn

对于这样的说法，大可不必完全相信。

Such claims should be regarded with a certain amount of skepticism.

zhè xiē tuī jiàn xìn dà kě bù bì lǐ huì

这些推荐信大可不必理会。

The recommendations can safely be ignored.