你在干吗？
nǐ zài gànma?
What are you doing?
别站着干吗？
bié zhàn zhe gànma?
Why are you just standing there?
你干吗这么做？
nǐ gànma zhème zuò?
Why are you doing this?
他干吗不来？
tā gànma bù lái?
Why isn't he coming?
