2 sentences for 干什么 (gàn​shén​me — why)

1. 你追我干什么？

   nǐ zhuī wǒ gàn​shén​me?

   Why are you chasing me?

   Source: OpenSubtitles

2. 你谢我干什么？

   nǐ xiè wǒ gàn​shén​me?

   What are you thanking me for?

   Source: OpenSubtitles