他本质不坏，只是被损友带坏了。

Tā běnzhì bú huài, zhǐshì bèi sǔnyǒu dàihuài le.

He isn't bad by nature, but he was damaged by a bad friend.

有的人的本质很坏。

Yǒu de rén de běnzhì hěn huài.

Some people are bad by nature.

他们在讨论宗教的本质。

Tāmen zài tǎolùn zōngjiào de běnzhì.

They are discussing the nature of religion.