WH- Questions
Learn how a question word opens a sentence to ask for specific information, how the word order that follows is built, and the one case where the usual inversion is not needed.
Asking for specific information
A wh- question asks for a detail that yes or no cannot supply.
A wh- question asks for a specific piece of information, such as a person, a place, a time, a reason or a method. It opens with a question word and cannot be answered with a simple yes or no.
In the sentence Where did she go?, the question word where asks for a place. It is followed by the auxiliary verb did and the subject she, using the same inversion found in a yes/no question.
Most question words share this pattern, though one case, where the question word itself is the subject, does not use inversion at all.
Before you begin
WH- questions are one pattern of question formation.
This lesson focuses on wh- questions specifically. Question formation as a whole includes three other patterns, each covered in its own lesson.
If you would like an overview of how questions are formed in general, begin with the Question Formation page.
The central idea
A question word replaces the piece of information being asked for.
Compare a yes/no question with a wh- question asking for one detail from it.
01
Yes/No Question
Did she go to the station?
02
WH- Question
Where did she go?
The useful question is: what piece of information is missing?
The question word replaces the specific detail, here the destination, that the speaker wants to know. The rest of the sentence keeps the same auxiliary-subject order used in a yes/no question.
The question words
Each question word asks for a different kind of detail.
who → a person: Who called?
what → a thing or an action: What happened?
where → a place: Where does she live?
when → a time: When does the film start?
why → a reason: Why was the meeting cancelled?
how → a manner or method: How did you fix it?
which → a choice among known options: Which train did you take?
whose → an owner: Whose bag is this?
The standard word order
Question word, then auxiliary verb, then subject.
With an existing auxiliary verb
Where is she going?
A form of be, have, or a modal verb moves after the question word and before the subject.
With do support
Where does she work?
When there is no other auxiliary verb, do, does or did is added, and the main verb returns to its base form.
The question word always comes first
Regardless of which auxiliary verb is needed, the question word opens the sentence, before any inversion takes place.
When the question word is the subject
No inversion is needed if the question word is asking about the subject.
Compare a question about the object of the sentence with a question about the subject.
01
Asking about the object
Who did you call?
02
Asking about the subject
Who called you?
When who or what performs the action itself, no auxiliary verb is added
In Who called you?, who is the one performing the action, so the sentence keeps the standard subject-verb order, exactly as a statement would.
How, extended
How combines with other words to ask about amount, frequency or duration.
how many → a countable amount: How many guests are coming?
how much → an uncountable amount: How much time do we have?
how often → frequency: How often does the train run?
how long → duration: How long did the flight take?
A useful decision guide
Ask what detail is missing, and who is doing the action.
01
What kind of detail is missing?
Choose the question word that matches: a person, place, time, reason or method.
02
Is an auxiliary verb already present?
If so, move it after the question word; if not, add do, does or did.
03
Is the question word asking about the subject?
If so, the sentence keeps the standard subject-verb order, with no inversion.
04
Does the question ask about amount, frequency or duration?
If so, pair how with many, much, often or long.
Common mistakes
The question word, the auxiliary verb and the subject each have a fixed place.
The subject and auxiliary verb must still invert.
Not: Where she is going?
Correct: Where is she going?
The question word alone does not form the question; the inversion after it is still needed.
Do support is not added when the question word is the subject.
Not: Who did called you?
Correct: Who called you?
When who is the one performing the action, the sentence needs no extra auxiliary verb.
The main verb keeps its base form after do support.
Not: Where does she works?
Correct: Where does she work?
Does already carries the present tense, so the main verb does not take its own ending.
Check your understanding
Which question word fits each sentence?
Choose the correct answer for each sentence.
__________ was the meeting rescheduled?
✅ Exactly! The question is asking for a reason.
❎ Not quite. Think about what kind of information the answer would give.
Would the answer explain a cause?
Which sentence correctly asks about the subject?
✅ Exactly! When the question word is the subject, no extra auxiliary verb is added.
❎ Not quite. Ask whether “who” is performing the action or receiving it.
Is “who” the one doing the calling, or the one being called?
__________ guests are coming to the party?
✅ Exactly! Guests is a countable noun, so how many is used.
❎ Not quite. Check whether guests can be counted one by one.
Can you count guests one, two, three?
Choose the best explanation
Select the sentence that explains the question correctly.
Why is “Where she is going?” not correctly formed?
✅ Exactly! A question word does not remove the need for the usual inversion.
❎ Not quite. Compare the word order to a correctly formed wh- question.
Why does “Who did called you?” need to be corrected?
✅ Exactly! When the question word performs the action, the sentence keeps the standard word order.
❎ Not quite. Ask who is performing the action of calling.
Try it another way
Complete each question.
Type the missing question word.
✅ Exactly! When asks for a specific time.
❎ Not quite. The answer this question is looking for is a time.
✅ Exactly! How long asks about duration.
❎ Not quite. This question is asking about the length of time the flight took.
Quick review
A question word opens the sentence and asks for a specific detail.
A wh- question begins with a question word, such as who, what, where, when, why or how, and asks for a specific piece of information.
The question word is followed by the same auxiliary-subject inversion used in a yes/no question.
When the question word is the subject of the sentence, such as who called you?, no inversion or extra auxiliary verb is used.
How combines with other words, such as many, much, often and long, to ask about amount, frequency or duration.
Remember
Identify the missing detail, then check who is performing the action.
Choose the question word that matches the missing detail. Then ask whether that question word is the subject of the sentence; if it is, the usual inversion is not needed.