Wh-questions

Questions with what, when, where, which, who(m), whose, why, how request specific information about something, and the circumstances surrounding actions and events (e.g. time, manner, place).The anticipated response to such questions is not yes or no, but information which provides the missing content of the wh-word:[discussing a new type of cooking grill]

Whose turn is it to wash up?

 How are you feeling?

A wh-question may include an emphatic do-auxiliary. In speech, the auxiliary is stressed. Such questions often occur in contexts where the asker feels they have not been given information they wanted or expected.

Non-emphatic wh-questions do not use auxiliary do when the wh-word is the subject. Emphatic wh-questions involve do-auxiliary even when the wh-word is the subject of the verb:

Who wants coffee?(non-emphatic) (Who does want coffee?)

What did happen in the end?  (emphatic)

A:   There was hardly anybody there.B:   Oh really? Who did turn up?(emphatic)