2 sentences

1. 我听到有人尖叫。

   wǒ tīng dào yǒu rén jiān​jiào.

   I heard someone screaming.

   Source: OpenSubtitles

2. 忽然有人尖叫。

   hū​rán yǒu rén jiān​jiào.

   Suddenly someone screamed.

   Source: OpenSubtitles