2 sentences

1. 干吗天天戴个面具鬼鬼祟祟的？

   gàn​má tiān​tiān dài gè miàn​jù guǐ​guǐ​suì​suì de?

   Why do you wear a mask all the time and go skulking around?

   Source: OpenSubtitles

2. 他鬼鬼祟祟地在门口张望，不知道在干什么。

   tā guǐ​guǐ​suì​suì de zài mén​kǒu zhāng​wàng, bù zhī​dào zài gàn shén​me.

   He was peeking around the door sneakily, and I don't know what he was up to.

   Source: Dong Chinese Dictionary