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Question words “WHAT / WHICH”

“What” is used when the question is general. “Which” is used
Open questions are questions that do not have See also: when there are two or more possibilities in the question.
simple “yes” or “no” answers. In English, they Forming questions 34 There are no choices in the question.
are formed by using question words. Prepositions of time 107

The question includes a choice of possible answers.
QUESTION WORDS

There are nine common question words in English.

What is used to ask When is used to ask
questions about things. questions about time.
FURTHER EXAMPLES

Where is used to ask about
Why is used to ask for reasons. places or directions.

“HOW OFTEN” AND “WHEN”

Whom is a formal version of “who,” that can “How often” is used to ask about the frequency with which someone does an activity.
only be used as an object of a question. “When” is used to ask about the specific time that they do something.
Who is used to ask about people.
“When” asks about the specific
“How often” asks about frequency. time something happens.

How can also be used with an adjective or
How is used to ask about a condition, an adverb to ask about the degree to which
or the way something is done. the adjective applies.

FURTHER EXAMPLES
Which is used to ask someone to specify Whose is used to ask who is
between two or more named things. the owner of something.

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