Relevant Grammatical Terms

I have scanned my books and cannot find the exact terms and therefore activities required to improve learners skill. This is the phrase I need them to feel comfortable with.

WOULD YOU MIND CALLING ME LATER?

Everwhere I have looked so far covers this partially not centrally enough so my learners will advance their understanding.

It is a polite request but most resources cover this minimally

How would you define this part of speech grammatically?

Thanks Dave