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"Adverbs that are used to ask questions are called Interrogative Adverbs."
They are usually placed at the beginning of a question.
Interrogative adverbs are used to ask different types of questions. For example,
» Why? : for what reason? ('why' is used to ask about reasons.) • Why don't you like her? » When? : at what time?. ('when' is used to ask about time-related matters.) • When does the play begin? » Where? : at what place?. ('where' is used to ask about place-related matters.) • Where can I find him? » How? : in what way?. ('how' is used to ask about matters related to manner, time, quantity, amount and degree.) • How was the experience?
» Why? : for what reason? ('why' is used to ask about reasons.)
• Why don't you like her?
» When? : at what time?. ('when' is used to ask about time-related matters.)
• When does the play begin?
» Where? : at what place?. ('where' is used to ask about place-related matters.)
• Where can I find him?
» How? : in what way?. ('how' is used to ask about matters related to manner, time, quantity, amount and degree.)
• How was the experience?
'WHY': Interrogative adverbs of reason.
'WHEN': Interrogative Adverbs of Time.
'WHERE': Interrogative adverbs of Place.
'How' can be used to form questions in four different ways.
1. Uses of "How" as an interrogative adverb of manner. 'How' can be used by itself to mean "in what way". (i.e., the manner in which the verb occurs).
2. Uses of "How" as an interrogative adverb of number or amount. 'How' can be used with much and many to ask about quantity. Much is used with uncountable nouns and many is used with countable nouns.
3. Uses of "How" as an interrogative adverb of degree or quantity. 'How' can be used with adjectives to ask about the degree of an attribute.
4. Uses of "How" as an interrogative adverb of frequency or degree of an action. 'How' can be used with other adverbs to ask about the frequency or degree of an action.