Wh- questions are so called because with the exception of the question word how, all the question words begin with the letters Wh. They are also called open questions because the number of possible responses is limitless.
Yes / No questions are also called closed questions because there are only two possible responses: Yes or No.
The verb DO plays an essential role when asking questions.
In any language, obtaining information can be complicated. To get information from another person requires the ability to ask questions. There are two primary forms of questions in English.