你一直看着我干吗？我脸上有东西吗？

Nǐ yìzhí kànzhe wǒ gànmá? Wǒ liǎnshang yǒu dōngxi ma?

Why are you staring at me? Is there something on my face?

你站在门口干吗？快进来啊。

Nǐ zhàn zài ménkǒu gànmá? Kuài jìnlái a.

What are you doing standing at the door? Come in quickly.

你一个人在教室里发呆干吗？

Nǐ yí gè rén zài jiàoshì lǐ fādāi gànmá?

Why are you spacing out alone in the classroom?