Interrogative word

Interrogative” redirects here. For the grammatical mood, see Interrogative mood.English grammar series

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In linguistics, an interrogative word is a function word used to introduce an interrogative clause. Interrogative words are also called wh-word because in English, most of them start with wh-. In English, they introduce several kinds of clauses: most questions (Where is he going?), interrogative content clauses (I wonder where he's going), certain relative clauses (The country where he was born), and certain adverb clauses (I go where he goes). These uses are all found in various other languages as well.

List of interrogative words in English:
interrogative determiner
which, what
whose (interrogative possessive determiner)
interrogative pro-form
interrogative pronoun
who, whom (human)
what, which (nonhuman)
interrogative pro-adverb
where (location)
whence (source)
whither (goal)
when (time)
how (manner)
why, wherefore (reason)
whether (choice between alternatives)