This question already has an answer here:
Normally, if I want to build a question about someone's verb, then I know the following formula.
building of statement.
Adding auxiliary verb in the beginning of the sentence and make it question.
adding WH question word before the auxiliary verb
It makes him happy > Does it make him happy? > What does make him happy?
Now my question is why do when we use the verb "weights" then we don't use the auxiliary verb in the 3rd stage (wh question word):
He weights 80 kg > Does he weights 80 kg? > Who weights 80 kg?
I found just a few results for: "who does weights" and a pretty much of them are not relevant. Maybe it's not about the word "weights" but it's about the wh question "who" that behaves as exceptional for the mentioned formula, and I see it a lot in the spoken language, but I don't have enough knowledge to say it confidently.