A special question word is a word used to ask a question, usually at the beginning of a sentence, and is used to ask about the grammatical meaning of an component in a sentence. There are several main categories of special question words in English:
Personal pronouns：who，whom，whose，what
Demonstrative pronouns：which，what
Adverbs of interrogative：when，where，why，how
Interrogative adjectives：what
Personal pronounsIt is used to ask the grammatical meaning of components such as subject, object, possessive, etc. of a sentence.
whoThe subject or object of a sentence used to ask a question, indicating a person or an animal. For example:
who is he?(Who is he?)）
who did you see?(Who do you see?)）
whomAn object used to ask a sentence that indicates a person or an animal. For example:
whom did you meet?(Who did you meet?)）
whoseThe possessive used to ask a question sentence for a person or animal. For example:
whose book is this?(Whose book is this?)）
whatIt is used to ask questions about the subject, object, possessive, and other components of the sentence to indicate people or animals, things, concepts, etc. For example:
what is your name?(What's your name?)）
what did you do?(What did you do?)）
what is this?(What is it?)）
Demonstrative pronounsUsed to ask questions about the grammatical meaning of a particular thing or concept in a sentence.
whichIt is used to ask a specific thing or concept in a sentence, indicating a person, animal, thing, concept, etc. For example:
which book do you want?(Which book do you want?)）
which way is the bus stop?(Which way does the bus stop?)）
Adverbs of interrogativeIt is used to ask the grammatical meaning of a particular time, place, why, how, etc. in a sentence.
whenUsed to ask the time in the sentence. For example:
when will you come back?(When are you coming back?)）
whereUsed to ask questions about places in sentences. For example:
where is the library?(The library is in **?.)
whyUsed to ask the reason for the sentence. For example:
why did you do that?(Why did you do that?)）
howThe way in which the sentence is asked. For example:
how do you get to the train station?(How do you get to the train station?)）
Interrogative adjectivesUsed to ask questions about the grammatical meaning of a particular thing in a sentence.
whatIt is used to ask a specific thing in a sentence, indicating a person, animal, thing, concept, etc. For example:
what is your f**orite food?(What's your favorite thing to eat?)）
Special question words are usually placed at the beginning of a sentence, but there are exceptions. For example, when answering a question sentence, a special question word can be placed at the beginning of the answer sentence.
For example: who is the man standing over there?(Who is the man standing there?)）
answer:the man standing over there is my father.(The man standing there was my father.) ）
When answering a question sentence, a special question word can be placed in the middle or end of the answer sentence, but this is rare.
For example: What is your name?(What's your name?)）
answer:my name is li ming.(My name is Li Ming.) ）
In a special interrogative sentence, the special interrogative word can usually be followed by a preposition, for example:
what do you want to eat?(What do you want to eat?)）
where did you go yesterday?(Where did you go yesterday?)）
In a special question sentence, the special question word can be used in conjunction with other words, such as:
what kind of car do you want to buy?(What kind of car do you want to buy?)）
which way is the nearest supermarket?(Which way is the nearest supermarket?)）