3 sentences for 發 (fā — become moldy)

1. 馒头放久了会发毛。

   mán​tou fàng jiǔ le huì fā máo.

   Steamed buns will go moldy if left for too long.

   Source: Dong Chinese Dictionary

2. 堆在地上的那些烂红薯都发腐了。

   duī zài dì shàng de nà​xiē làn hóng​shǔ dōu fā fǔ le.

   The rotten sweet potatoes piled on the ground have started to decay.

   Source: Dong Chinese Dictionary

3. 这些馒头已经放得发了，千万别吃。

   zhè​xiē mán​tou yǐ​jīng fàng de fā le, qiān​wàn bié chī.

   These steamed buns have gone bad; definitely don't eat them.

   Source: Dong Chinese Dictionary