Interrogative pronouns are words used to ask questions. They include:
* who
* whom
* whose
* what
* which
"Can" is a modal verb, which is used to express ability, possibility, permission, or request.
For example:
* Can you help me with this? (asking about ability)
* Can it be true? (asking about possibility)
* Can I borrow your pen? (asking for permission)
Let me know if you have any other questions!