What are the rules for using interrogative pronouns in grammar syntax?

The rules for using interrogative pronouns in grammar syntax are as follows:

1. Interrogative pronouns are used to ask questions and gather information about people or things. They include words such as "who," "whom," "whose," "what," "which," and "where."

2. Interrogative pronouns are typically used at the beginning of a sentence or question. For example, "Who is coming to the party?" or "What is your favorite color?"

3. The choice of interrogative pronoun depends on the type of information being sought. "Who" is used to ask about people, "what" is used to ask about things or actions, "which" is used to ask about a specific choice or selection, and "where" is used to ask about a location.

4. Interrogative pronouns can be used to replace a noun in a sentence. For example, instead of saying "I don't know the person," you can say "I don't know who."

5. When using interrogative pronouns, it is important to ensure subject-verb agreement. For example, "Who is going to the party?" (singular subject) versus "Who are going to the party?" (plural subject).

6. Interrogative pronouns can also be used in indirect questions, where the question is embedded within a statement. For example, "I wonder who is coming to the party."

7. It is important to note that the pronoun "whom" is used in formal or written English to refer to the object of a verb or preposition. However, in informal or spoken English, "who" is often used instead.

Overall, the rules for using interrogative pronouns involve understanding their purpose, placement in a sentence, subject-verb agreement, and the appropriate choice based on the type of information being sought.