5 sentences

1. 这些车是干什么用的？

   zhè​xiē chē shì gàn​shén​me yòng de?

   What are all these cars for?

   Source: OpenSubtitles

2. 你带这么多行李干什么？

   nǐ dài zhè​me duō xíng​li gàn​shén​me?

   Why are you bringing so much luggage?

   Source: Dong Chinese Dictionary

3. 观众干什么笑呢？

   guān​zhòng gàn​shén​me xiào ne?

   Why's the audience laughing?

   Source: OpenSubtitles

4. 你看着我干什么？

   nǐ kàn zhe wǒ gàn​shén​me?

   Why are you looking at me?

   Source: OpenSubtitles

5. 你现在在干什么呢？

   nǐ xiàn​zài zài gàn​shén​me ne?

   What are you doing now?

   Source: Dong Chinese Dictionary