2 sentences for 反面 (fǎn​miàn — reverse side)

1. 请在这张纸的反面签字。

   qǐng zài zhè zhāng zhǐ de fǎn​miàn qiān​zì.

   Please sign on the back of this sheet of paper.

   Source: Dong Chinese Dictionary

2. 他总是把旧作业本的反面也写满，生活非常节省。

   tā zǒng​shì bǎ jiù zuò​yè​běn de fǎn​miàn yě xiě​mǎn, shēng​huó fēi​cháng jié​shěng.

   He always fills the back of his old notebooks with writing; he leads a very frugal life.

   Source: Dong Chinese Dictionary