Interrogative word

interrogative pronouninterrogativeinterrogativesinterrogative pronounswh-word-everquestion wordinterrogative wordsinterrogative particlequestion words
An interrogative word or question word is a function word used to ask a question, such as what, when, where, who, whom, why, and how.wikipedia
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Who (pronoun)

whowhomwho/whom/whose
An interrogative word or question word is a function word used to ask a question, such as what, when, where, who, whom, why, and how.
The pronoun who, in English, is an interrogative pronoun and a relative pronoun, used chiefly to refer to humans.

Five Ws

CircumstancesWho? What? Where? Why? and How? questionsWho, what, when, where, why, how
They are sometimes called wh-words, because in English most of them start with wh- (compare Five Ws).
According to the principle of the Five Ws, a report can only be considered complete if it answers these questions starting with an interrogative word:

Interrogative

interrogative sentenceinterrogative moodQuestions
For more information about the grammatical rules for forming questions in various languages, see Interrogative.
Interrogative sentences can serve as yes–no questions or as wh-questions, the latter being formed using an interrogative word such as who, which, where or how to specify the information required.

Pro-form

proformCorrelativespro-forms
interrogative pro-form
An interrogative pro-form is a pro-form that denotes the (unknown) item in question and may itself fall into any of the above categories.

Pronoun

pronounspronominalpronominally
interrogative pronoun
Subtypes include personal pronouns, reflexive and reciprocal pronouns, possessive pronouns, demonstrative pronouns, relative pronouns, interrogative pronouns, and indefinite pronouns.

List of Latin-script digraphs

ngrrnj
They are sometimes called wh-words, because in English most of them start with wh- (compare Five Ws). Ultimately, the English interrogative pronouns (those beginning with wh in addition to the word how), derive from the Proto-Indo-European root k w o- or k w i, the former of which was reflected in Proto-Germanic as χ w a- or kh w a-, due to Grimm's law.
is used Faroese and Icelandic for (often ), generally in wh-words, but also in other words, such as Faroese hvonn.

Question

wh-questionanswerquestions
An interrogative word or question word is a function word used to ask a question, such as what, when, where, who, whom, why, and how.
The other main type of question (other than yes–no questions) is those called wh-questions (or non-polar questions, or special questions ). These use interrogative words (wh-words) such as when, which, who, how, etc. to specify the information that is desired.

Determiner

determinersdeterminativedemonstrative determiners
interrogative determiner
That is, a determiner may indicate whether the noun is referring to a definite or indefinite element of a class, to a closer or more distant element, to an element belonging to a specified person or thing, to a particular number or quantity, etc. Common kinds of determiners include definite and indefinite articles (like the English the and a or an), demonstratives (this and that), possessive determiners (my and their), quantifiers (many, few and several), numerals, distributive determiners (each, any), and interrogative determiners (which).

Proto-Indo-European pronouns

pronounsIndo-European rootk w o-'' or ''k w i
Ultimately, the English interrogative pronouns (those beginning with wh in addition to the word how), derive from the Proto-Indo-European root k w o- or k w i, the former of which was reflected in Proto-Germanic as χ w a- or kh w a-, due to Grimm's law.
There was also a pronoun with the stem (adjectival ) used both as an interrogative and an indefinite pronoun.

English language

EnglishEnglish-languageen
They are sometimes called wh-words, because in English most of them start with wh- (compare Five Ws).
Both yes–no questions and wh-questions in English are mostly formed using subject–auxiliary inversion (Am I going tomorrow?, Where can we eat?), which may require do-support (Do you like her?, Where did he go?). In most cases, interrogative words (wh-words; e.g. what, who, where, when, why, how) appear in a fronted position.

English relative clauses

relative clausesrelative pronounsnon-finite relative clause
To form free relative clauses, as in I'll do whatever you do, Whoever challenges us shall be punished, Go to wherever they go. In this use, the nominal -ever words (who(m)ever, whatever, whichever) can be regarded as indefinite pronouns or as relative pronouns.
The words used as relative pronouns have other uses in English grammar: that can be a demonstrative or a conjunction, while which, what, who, whom and whose can be interrogatives.

Relative pronoun

relativerelative pronouns
They may be used in both direct questions (Where is he going?) and in indirect questions (I wonder where he is going). In English and various other languages the same forms are also used as relative pronouns in certain relative clauses (The country where he was born) and certain adverb clauses (I go where he goes).
For example, the English which is also an interrogative word.

Indefinite pronoun

indefiniteanybodynone
To form free relative clauses, as in I'll do whatever you do, Whoever challenges us shall be punished, Go to wherever they go. In this use, the nominal -ever words (who(m)ever, whatever, whichever) can be regarded as indefinite pronouns or as relative pronouns.

Mongolian language

MongolianMongolKhalkha-Mongolian
Mongolian:
Other word (sub-)classes include interrogative pronouns, conjunctions (which take participles), spatials, and particles, the last being rather numerous.

Grimm's law

Germanic Sound Shiftdiscoveries of the GrimmsGrimm
Ultimately, the English interrogative pronouns (those beginning with wh in addition to the word how), derive from the Proto-Indo-European root k w o- or k w i, the former of which was reflected in Proto-Germanic as χ w a- or kh w a-, due to Grimm's law.
One of the more conspicuous present surface correspondences is the English digraph wh and the corresponding Latin and Romance digraph qu, notably found in interrogative words (wh-words) such as the five Ws.

Locative adverb

hencewhencethence
whence (source)
As can be seen from these examples, the anaphoric locative adverbs generally have a close relationship with the demonstratives (in English, this and that). They are also usually closely related to locative interrogative adverbs; in English, there is (or, at least, once was) a formal relationship between "where/there/here", "whither/thither/hither", and "whence/thence/hence".

Relative clause

relativerelative clausesfree relative clause
To form free relative clauses, as in I'll do whatever you do, Whoever challenges us shall be punished, Go to wherever they go. In this use, the nominal -ever words (who(m)ever, whatever, whichever) can be regarded as indefinite pronouns or as relative pronouns. They may be used in both direct questions (Where is he going?) and in indirect questions (I wonder where he is going). In English and various other languages the same forms are also used as relative pronouns in certain relative clauses (The country where he was born) and certain adverb clauses (I go where he goes).
However, the relative clause in (7a) looks more like an indirect question, complete with the interrogative complementiser, kung 'if', and a pre-verbally positioned WH-word like saan 'where', as in (7b).

What

What is an interrogative pronoun and adverb in English.

Udmurt grammar

plural marker
Udmurt interrogative pronouns inflect in all cases.

How

how(e)
How, an interrogative word in English grammar

Inanimate whose

inanimate ''whoseto things as well as persons
The inanimate whose is restricted to the relative pronoun; English speakers do not use whose as a non-personal interrogative possessive: the whose in "Whose car is this?"

Comparison of Portuguese and Spanish

Spanish and PortugueseSpanishits neighbor and relative
Spanish uses an acute accent on interrogative pronouns, while the corresponding relative pronouns (etymologically the same words) are spelled without the accent to mark the difference in prosodic stress.

Wh-movement

wh''-frontingwh-frontingwh-in-situ
The special interrogatives, whatever the language, are known within linguistics as wh-words because most interrogative words in the English language start with a wh-; for example, who(m), whose, what, which, etc. Wh-words are used to form questions, and can also occur in relative clauses.

English clause syntax

frontingconditional
In interrogative main clauses, unless the subject is or contains the interrogative word, the verb precedes the subject: Are you hungry? Where am I? (but Who did this?, without inversion, since the interrogative who is itself the subject).

Ngaatjatjarra people

Ngaatjatjarra
The ethnonym Ngaatjatjarra, in line with a general practice in their area, combines the interrogative pronoun used by each tribe for "who", "what".