2 sentences

1. 这完全是他的虚荣心在作祟。

   zhè wán​quán shì tā de xū​róng​xīn zài zuò​suì.

   This was purely his vanity at work.

   Source: Dong Chinese Dictionary

2. 迷信的人总觉得这间老屋有鬼怪在作祟。

   mí​xìn de rén zǒng jué​de zhè jiān lǎo​wū yǒu guǐ​guài zài zuò​suì.

   Superstitious people always feel that this old house is haunted by ghosts or demons.

   Source: Dong Chinese Dictionary