1.	Interrogative pronouns

2.	List of interrogative words in English

2.1	Interrogative determiner

2.2	Interrogative pro-form

3.	Who vs whom

4.	Examples of interrogative pronouns in which the interrogative pronoun stands in for the answer to the question

4.1	In these examples, the same words are relative pronoun

4.2	In these examples, the same words are personal pronoun

“List of interrogative words in English:
• interrogative determiner
o which, what
o whose (interrogative possessive determiner)

• interrogative pro-form
o interrogative pronoun
 who, whom (human)
 what, which (nonhuman)
These pronouns can be personal or non-personal. We can find "who", "whom" and occasionally "which" used to refer to people and "which" and "what" used to refer to things and to animals.
An interrogative pronoun may look like an interrogative adjective, but it is used differently in a sentence: it acts as a pronoun, taking the place of a noun.
In addition, these pronouns may be in the compounds formed with the suffixes "-ever" or "-soever" and it is because of an emphasis of these words:
1. "-ever": "whoever", "whomever", "whichever" and "whatever"
2. "-soever": "whosoever"
"Who" acts as the subject of a verb, while "whom" acts as the object of a verb, preposition or a verbal.
Who is the subject and whom is the object.

In connection with an interrogative pronoun is a preposition placed at the end or at the begining of the sentence:
Who did you speak about?
About whom did you speak?
What town do you live in?
In what town do you live?"

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