3 sentences

1. 他能把这些字母反过来背。

   tā néng bǎ zhè​xiē zì​mǔ fǎn​guo​lái bèi.

   He can recite these letters backward.

   Source: Dong Chinese Dictionary

2. 你把衣服穿反了，快反过来。

   nǐ bǎ yī​fu chuān fǎn le, kuài fǎn​guo​lái.

   You have your clothes on inside out; turn them the right way.

   Source: Dong Chinese Dictionary

3. 反过来，如果他不配合，我们的计划就无法进行。

   fǎn​guo​lái, rú​guǒ tā bù pèi​hé, wǒ​men de jì​huà jiù wú​fǎ jìn​xíng.

   Conversely, if he doesn't cooperate, our plan cannot proceed.

   Source: Dong Chinese Dictionary