4 sentences

1. 他的鞋上沾满了泥巴。

   tā de xié shàng zhān​mǎn le ní​ba.

   His shoes were covered in mud.

   Source: Dong Chinese Dictionary

2. 答案就在泥巴里。

   dá'àn jiù zài ní​ba lǐ.

   The answer lies in the mud.

   Source: OpenSubtitles

3. 他把手里的泥巴捏成了一个圆坨。

   tā bǎ shǒu lǐ de ní​ba niē chéng le yī gè yuán tuó.

   He molded the mud in his hands into a round lump.

   Source: Dong Chinese Dictionary

4. 下雨以后，小孩子们在院子里开心地玩泥巴。

   xià​yǔ yǐ​hòu, xiǎo​hái​zi men zài yuàn​zi lǐ kāi​xīn de wán ní​ba.

   After the rain, the children played happily with mud in the yard.

   Source: Dong Chinese Dictionary