2 sentences for 念叨 (niàn​dao)

1. 奶奶经常念叨着要回老家看看。

   nǎi​nai jīng​cháng niàn​dao zhe yào huí lǎo​jiā kàn kàn.

   Grandma often talks about going back to visit her hometown.

   Source: Dong Chinese Dictionary

2. 他嘴里不停地念叨着，不知道在抱怨什么。

   tā zuǐ lǐ bù​tíng de niàn​dao zhe, bù zhī​dào zài bào​yuàn shén​me.

   He kept muttering to himself, though I don't know what he was complaining about.

   Source: Dong Chinese Dictionary