2 sentences for 卖 (mài — betray)

1. 他就是这样将灵魂卖给魔鬼的。

   tā jiù shì zhè​yàng jiāng líng​hún mài gěi mó​guǐ de.

   That's how he sold his soul to the devil.

   Source: OpenSubtitles

2. 你竟然为了这点小利就把朋友卖了。

   nǐ jìng​rán wèi le zhè diǎn xiǎo lì jiù bǎ péng​you mài le.

   You actually sold out your friend for such a small gain.

   Source: Dong Chinese Dictionary