Video on Question Tags

ADDITIONAL INFORMATION TO THE VIDEO: IN THIS VIDEO THEY TREAT "HAVE" AS AN AUXILIARY VERB, WHICH IS NOT STRICTLY WRONG. HOWEVER, WHEN "HAVE" FUNCTIONS AS A LEXICAL VERB ("I DON'T HAVE MUCH TIME" -POSSESSION- OR "I'M HAVING A SHOWER/A HAMBURGER" -TAKING OR EATING-) IT MORE OFTEN THAN NOT WORKS AS A NORMAL VERB THAT NEEDS THE AUXILIARY "DO" IN THE QUESTION TAG.

EXAMPLES:

HE DOESN'T HAVE MUCH TIME, DOES HE?
HE HAS A HAMBURGER EVERY FRIDAY EVENING, DOESN'T HE?

CONTRAST WITH:

THEY HAD DONE THEIR HOMEWORK, HADN'T THEY? -IN THIS CASE, "HAVE" IS A REAL AUXILIARY VERB.