An interrogative pronoun is a word that takes the place of a noun that is not known.
But for a reason unbeknownst to myself, only the words 'who and what (also whom, whose, which, and their -ever forms)' are considered interrogative pronouns.
Who is this? (unknown person- a person is a noun)
What is this? (unknown thing- a thing is a noun)
Other words, such as 'when, where, why and how' seem to clearly fit the criteria of an interrogative pronoun but instead are generally considered adverbs. Why is this?
When is this? (unknown time- a time is a noun)
Where is this? (unknown place- a place is a noun)
Why is this? (unknown idea- an idea is a noun)
How is this? (unknown quality- a quality is a noun)
Last edited by c3d8; 02-Oct-2014 at 16:56. Reason: elaboration
Are you suggesting that the fact that a word can go before is this makes it of a single category?
Who is this? It's John.
Why is this? It's because it was made this way.
Are these still identical?
Who is this? It's the one that was made this way.
Why is this? It's equality.
I'm suggesting that when, where, why,and how may be (seem to be to me) more pronominal than adverbial. That said, I must say that I consider myself a novice and am not trying to change something that cannot and should not be changed. However, those four words are usually defined as adverbs (rarely pronouns), and the online parsing machines have also labeled them as such, though as I implied, this categorization is not with complete assention. For instance, on the third page of this link, http://www.ucl.ac.uk/internet-grammar/nouns/nouns, the aforementioned words are categorized as interrogative pronouns.
Last edited by c3d8; 03-Oct-2014 at 15:57. Reason: editing