No. You could say 'what have you prepared for breakfast' or 'what did you prepare for breakfast' instead.
No, it is not correct. The correct phrasing would be "What did you prepare for breakfast?" or "What did you have for breakfast?"
My sister usually has breakfast at half past eight.
It depends on the context. Both of these examples are correct: Ask permission of her. You need to ask for permission. The former is slightly formal, while the latter is more casual.
A correct way to ask this question is, "What were you doing before?"
Yes, it is correct to ask "Are they an item?" when inquiring about the relationship status of two people to find out if they are romantically involved with each other.
No, "hows you" is not correct grammar. The correct way to ask that question would be "How are you?" or "How are you doing?"
"What do you like for breakfast?" would be correct.
"Waiting for our breakfast to be served" is correct.
Breakfast and lunch were . . . "
The correct spelling of the plural noun is "dinners," and "breakfast" is correct.
when my wife prepared me some nice breakfast
Yes. It's not a complete sentence. You must say what was prepared. But that is correct phrasing. Paperwork was prepared for this transaction. I was prepared for his resignation. Dinner was prepared by the children. Was the package prepared for shipping? The report was not prepared on time.
Yes, this is the correct way of telling someone to "cook breakfast."
"Have had" is correct. For example: The children have had their breakfast.
It depends who you ask. Soup can be for breakfast, lunch or dinner.
"Did you have your breakfast" is the better one to use.
For breakfast I like milk and pancakes.
It is NOT correct; it should be: He has neither had his breakfast nor IS HE coming out of his room (the inversion is used here for emphasis and effect).