4 sentences

1. 你的肚子在咕咕叫呢。

   nǐ de dù​zi zài gū​gū jiào ne.

   Your stomach is growling.

   Source: AI Challenger 2017

2. 当猫饥饿时，它咕噜咕噜叫。

   dāng māo jī'è shí, tā gū​lu gū​lu jiào.

   When a cat is hungry, it purrs.

   Source: AI Challenger 2017

3. 他端起一碗水，咕嘟咕嘟地喝了下去。

   tā duān qǐ yī wǎn shuǐ, gū​dū gū​dū de hē le xià qu.

   He took up a bowl of water and gulped it down.

   Source: UM-Corpus: Education

4. 你在嘀咕什么？

   nǐ zài dí​gu shén​me?

   What are you muttering about?

   Source: OpenSubtitles