2 sentences for 先后 (xiān​hòu — priority)

1. 做事要分轻重先后。

   zuò shì yào fēn qīng​zhòng xiān​hòu.

   One must prioritize tasks based on their importance and order.

   Source: Dong Chinese Dictionary

2. 你把这个词的先后顺序写颠了。

   nǐ bǎ zhè gè cí de xiān​hòu shùn​xù xiě diān le.

   You have written the order of these words backward.

   Source: Dong Chinese Dictionary