use of "YET" in an affirmative question

English as a Second Language English Vocabulary, Grammar and Idioms
1

Hi There!

Could you tell me what the use of “YET” in an affirmative question is?

2

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It is an adverb with several meanings:

  1. at the present time; now:Are they here yet?
  2. up to a particular time; thus far: Have they come yet?
  3. in the time still remaining; before all is done: Is there yet time?
  4. from the preceding time; as previously; still: Are they yet at their summer cottage?
  5. in addition; again: Has the mail brought yet another reply?
  6. moreover: Have you ever read it or yet intend to?
  7. even; still (used to emphasize a comparative): Is this a yet milder tone?
  8. though the case be such; nevertheless: This is strange; yet is it very true?
3

Thanks Dear Mister Micawber. However, I have a bunch of more questions:

What are the situations below called in English:

  1. when a person keeps his head over the steam rising from a boiled water in case he has a cold or wants to have a softer skin.
  2. When one is so sure about his claim, but finally those against him prove that he isn’t and they start laughing at him.
  3. When you make a person ashamed in public.
  4. When you don’t want to do sth but you do it because you can’t say “No.”

What is the difference between Market, Bazaar, Mall and Shopping Center?

4

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I can’t think of anything except for #3: embarrass.
.

5

What’s the meaning here? Does “yet” fit well with the past simple?

Did you eat yet?