Polar interrogatives are usually used to ask questions whose answers are expected to be either โyesโ or โnoโ. They have non-manual markers that distinguish them from content questions and these non-manual markers spread over the question completely or partially. Polar interrogatives can also have question particles.
Here is an example of a polar interrogative. Here and in the rest of the sub-sections of 1.2.1., the non-manual marker notation โy/nโ refers to the bundle of non-manual markers in polar interrogatives.
y/n
understand ฤฑx2
โDo you understand?โ