Chinese phrase
任课老师是〜吗？ rèn kè lǎo shī shì 〜 ma
Meaning
Is the teacher in charge of the class ___?
When to use it
It asks if a particular person is in charge of the class. It is a neutral way to check who teaches the class.
Example dialogue
你们的汉语课 任课老师是 外教 吗？ nǐ men de hàn yǔ kè rèn kè lǎo shī shì wài jiào ma
Is the teacher in charge of your Chinese class a foreign teacher?
不是，是我们学校的李老师。 bú shì shì wǒ men xué xiào de lí lǎo shī
No, it is Li, a teacher at our school.