A question to my dear colleagues

[Mr.Ahmed EL-hady]

I think that we can not use verb to do with 'who' questions when we ask about the object ,however we use it in positive statements as Emphasis
but why we use it like this? could be one or more reasons.


for example, we use it as emphasis
or
a denial of previous statement:
A: you don't love me
B: I do love you

but, somehow, your sentence isn't wrong

let's say:
Teacher: Who opened the door?
Ahmed: Not me.
Hady: Nor me
Mayada: I didn't either
Teacher: well, someone must have. who did open the door?
so

we can use verb to do with 'who questions' but it isn't common but it is quite correct

And After all,we taste English

Who got it??
who did get it?
?