Can you say who does have then a main verb?

Answer 1

Let's try!...

* Who does have jump/jumped in the river? No! This doesn't make sense! * Who has jumped in the river? is OK. It is the question form of the Present Perfect tense. But 'Who has jumped in the river?' is not in the same form as the question asked.

['The new students have jumped in the river!' is a possible positive statement/reply!]

Let's try a different verb...

* Who does have burn/burned the toast? No! This doesn't make sense either! * But 'Who has burned the toast?' would be a valid question! (Hopefully the answer is not those new students again!)

So the question 'Who does have ...(something)...?' requires 'something', i.e. a noun or pronoun.

For example:

* Who has a rich Uncle? is a good question. * And if a teacher says: Who does have a rich Uncle? she means 'Who really has a rich Uncle?

Conclusion: The question: 'Who does have ... ?' is always followed by a noun or pronoun. 'To have' is the main verb. It is not followed by another verb.