When did you born?
is not a grammatical sentence, because born is the past participle of the verb to bear, whereas you must use the bare infinitive after did.
The verb to bear means to generate among other things, so your question can be correcty asked using a passive form,
When were you born?
which is equivalent to, but much more frequent than, *When were you given birth to?"
If your friend wants to answer this question in a grammatically correct way, they should answer I was born on ...
This is not a normal English grammar structure.
The rules of Jeopardy require that contestants answer the clue in the form of a question.
I tend to think of it this way... it's a backwards game show. Most game shows require that the host ask a question:
Who was the first president of the United States of America?
And contestants provide the answer:
George Washington.
With Jeopardy, it's the other way around. The host is answering the question while the contestants are asking it...
So, if the clue is:
This man was the first president of the United States of America.
The rules require the response be
Who is George Washington?
If they fail to do this, even if they're technically correct, they lose points.
So, if a contestant answered:
George Washington.
They would be wrong by the rules of the game.
As to their hesitant tone, sometimes they're not completely sure of the answer, so they're guessing.
Best Answer
The 'inversion' involved in questions involves the subject changing places with the first auxiliary in a verbchain, and only the first; all other verbs in the chain come after the subject, in their normal order.
So if this is your declarative sentence:
it is only the project and will which change places: