3 sentences

1. 这种布料很难分出好坏。

   zhè zhǒng bù​liào hěn nán fēn​chū hǎo​huài.

   It is difficult to tell the quality of this fabric.

   Source: Dong Chinese Dictionary

2. 他在大是大非面前显得非常暗，甚至不分好坏。

   tā zài dà​shì​dà​fēi miàn​qián xiǎn​de fēi​cháng àn, shèn​zhì bù fēn hǎo​huài.

   He seemed very muddled regarding major issues of right and wrong, even failing to distinguish between good and bad.

   Source: Dong Chinese Dictionary

3. 你这人好坏，竟然这样捉弄我。

   nǐ zhèi rén hǎo​huài, jìng​rán zhè​yàng zhuō​nòng wǒ.

   You are so mean to play a trick on me like that.

   Source: Dong Chinese Dictionary