Yes, sometimes. But it depends on your question.
You can certainly use pronouns in a question on this site where necessary. An example of a question that uses a pronoun - in this case, the word "you" - is this: "How do you know if someone has answered your question on WikiAnswers?"
On the other hand, if you ask a question such as "Where does he live?" the question makes no sense without using the name of the specific person about whom you're trying to find information.
From the WikiAnswers Style Guide:
Use the second person pronoun, you and your,instead of I, me, and my. For example, How do you know you are pregnant? instead of How do I know if I'm pregnant? Do not use the formal one, as in How does one know she is pregnant? This helps other people realize that our questions are for everyone, not only for the individual who asked them.
(To access the Style Guide, click on the Related question.)
The pronouns use to form questions are interrogative pronouns. Interrogative pronouns take the place of the noun that is the answer to the question.The interrogative pronouns are: who, whom, what, which, whose.Where are you? I'm at school.Which coat do you like? I like the this one.
I'm not sure what you mean by using pronouns as prepositions. Can you provide an example or more context so I can better understand your question?
He loved her. She loved him. The question here demostrates how dangerous the use of pronouns without antecedents can be.
Possessive pronouns answer the question "Whose?" or "To whom does it belong?" by indicating ownership or possession of something. Examples of possessive pronouns include "mine," "yours," "his," "hers," "ours," and "theirs."
The pronouns in the nominative case you would use: he, she, it, they The pronouns in the Objective case: him, her, it, them, The pronouns in the Possessive case: his,her, hers, it, their, theirs
The pronouns for a female are she, her, hers. The pronouns for a male are he, him, his. The pronouns for a group are they, them, their, theirs. The pronouns for a group of babies are they, them, their, theirs.
Never Ever use personal pronouns in a essay or a hypothesis :)
To answer the question "How are you?", use the first person, subjective, personal pronoun "I" or "we", since the pronoun "you" is both singular and plural. Examples:How are you? I am fine.How are you? We are fine.
Interrogative pronouns introducea question. The interrogative pronoun takes the place of a noun that is the answer to the question.They are: who, whom, what, which, whose.
Your question muddles pronouns, I place the correct parings below. "his" and "hers" "him" and "her" Not these pronouns are not age specific.
The pronouns in your sentence are:what, an interrogative pronoun which introduces the question;all, an indefinite pronoun which takes the place of an unspecified number (of pronouns in this sentence).
When the pronouns who, whom, whose, which, and that are used to introduce dependent clauses they are relative pronouns.When the pronouns who, whom, whose, and which are used to introduce a question, they are interrogative pronouns.