@CrazyEyes Ah, my apologies. I should have left a longer comment (or possibly used the more common term "emphatic polarity"). In English, speakers often stress the affirmative or negative polarity of a sentence by stressing an auxiliary verb, and this is often in contrast to a previous utterance of the opposite polarity:
"Noon doesn't work for me, either." "Well then, what time does sound good to you?" When there's no auxiliary present, the dummy auxiliary
do is inserted for this purpose. This insertion is grammatical, but it only makes sense in certain contexts. —
snailboat 18 secs ago