4 sentences for 吗 (má)

1. 不知道他现在在干吗。

   bù zhī​dào tā xiàn​zài zài gàn má.

   I wonder what he's doing now.

   Source: OpenSubtitles

2. 那只猴子在干吗呀？

   nà zhī hóu​zi zài gàn má ya?

   What's that monkey doing?

   Source: OpenSubtitles

3. 你在里面干吗呢？

   nǐ zài lǐ​miàn gàn má ne?

   What are you doing in there?

   Source: OpenSubtitles

4. 你干吗呢？

   nǐ gàn má ne?

   What are you doing?

   Source: Dong Chinese Dictionary