Combining Chinese and English, we can know who to ask questions to, the math teacher, so who is it, the math teacher.
To do this kind of questions, first, according to the spelling of the words or phrases to be examined in a given Chinese clear sentence, and then combined with the relevant grammar knowledge, make formal changes to the words or phrases.
There are also the following same forms:
Who is it? Is it? Yours Art? Teacher, who is your art teacher? Change the subject.