WH questions ask for specific information about a person, thing, place, time, reason, or manner. They usually begin with words such as who, what, where, when, why, or which.
For example:
- Who approved the revised timetable?
- Where can I collect my replacement ticket?
- Why was the appointment canceled?
Each question asks for a particular detail rather than a simple yes or no. Although most question words begin with wh, how belongs to the same group because it serves a similar purpose.
To form a WH question, you need to choose the word that matches the information you want and arrange the rest of the sentence correctly.
WH Question Words and Their Uses
| Question word | Asks about | Example question | Possible answer |
|---|---|---|---|
| Who | A person | Who arranged the community fundraiser? | The neighborhood association. |
| Whom | A person as an object, mainly in formal English | Whom did the director appoint? | Ms. Patel. |
| Whose | Possession or association | Whose jacket was left in the conference room? | Daniel’s. |
| What | A thing, action, or information | What caused the flight delay? | A technical inspection. |
| Which | A choice or identification | Which entrance is open after six? | The entrance beside the car park. |
| Where | A place | Where can I return the borrowed equipment? | At the service desk. |
| When | A time or occasion | When will the new library membership cards arrive? | Early next week. |
| Why | A reason or purpose | Why was the outdoor market canceled? | Because of the severe weather warning. |
| How | A method, manner, condition, or degree | How did you recover the deleted photographs? | By restoring an earlier backup. |
Some question words have more than one grammatical function.
Which proposal received the most support?
Here, which comes before the noun proposal. It functions as an interrogative determiner, traditionally called an interrogative adjective.
Which received the most support?
Here, which stands independently as an interrogative pronoun.
Common WH Question Phrases with How
How often combines with another word to ask about a quantity, measurement, frequency, or degree.
| Question phrase | Asks about | Example |
|---|---|---|
| How many | Number of countable things | How many passengers missed the connecting train? |
| How much | Amount or price | How much water does the garden need each week? |
| How long | Duration or length | How long will the temporary road closure last? |
| How often | Frequency | How often does the building’s fire alarm get tested? |
| How far | Distance or extent | How far is the campsite from the nearest village? |
| How old | Age | How old was the ship when it was restored? |
| How soon | Time before something happens | How soon can the replacement screen arrive? |
| How well | Quality or degree of success | How well did the students adapt to the new timetable? |
One useful distinction is between how many and how much.
Use how many when asking about the number of countable people or things:
How many chairs are needed for the workshop?
Use how much when asking about an amount of something uncountable:
How much paint is needed to cover the wall?
Nouns such as equipment and furniture are normally uncountable. When counting individual objects, we use expressions such as pieces of equipment or items of furniture.
How much also asks about prices:
How much does the annual parking permit cost?
For more examples of these expressions, see how in English.
How to Choose the Right WH Question
A good starting point is to identify the information you don’t know.
Consider this statement:
On Tuesday, a technician sent the updated inspection report to the project manager because the test results had changed.
The sentence tells us who sent the report, what was sent, when it was sent, who received it, and why it was sent.
If one of those details were missing, we could ask:
| Information needed | Suitable WH question |
|---|---|
| Person who sent the report | Who sent the updated inspection report? |
| Document sent | What did the technician send? |
| Recipient | Who did the technician send the report to? |
| Time | When did the technician send the report? |
| Reason | Why did the technician send an updated report? |
Now consider:
How did the technician send the report?
This is a grammatically correct question, but we still don’t know whether the report was sent by email, through a shared folder, or by another method.
If you wanted to know the recipient, how would not be the right choice.
A question can follow every grammar rule and still ask for the wrong information.
When Two Question Words Seem Possible
Sometimes two question words are grammatical, but they lead to different answers.
What vs. Which
What book did you choose for the reading group?
Which book did you choose for the reading group?
What is generally more open-ended. Which often suggests choosing from a known or identifiable set.
This isn’t an absolute rule. Both words can sound natural in the same situation, depending on what the speaker has in mind.
When vs. How Long
When did the renovations begin?
How long did the renovations take?
The first asks when the work started. An answer might be in April.
The second asks about duration. An answer might be five months.
Why vs. How
Why did the restaurant change its booking system?
How did the restaurant change its booking system?
The first asks for the reason behind the decision. The second asks about the process.
A response to why might explain that the old system caused frequent booking errors. A response to how might describe the software installation and staff training.
For more examples of reason questions, see why questions in English.
How to Form WH Questions
Choosing the question word is only the first part. You also need the correct word order.
For many questions about information other than the subject, the usual pattern is:
WH word or phrase + auxiliary verb + subject + main verb
Where did the delivery driver leave the parcel?
Why has the website stopped accepting applications?
When will the revised contract be ready?
Not every WH question needs all these elements. The structure depends on the verb and the grammatical role of the information you’re asking about.
WH Questions with Be, Auxiliary Verbs, and Modals
If a statement already contains an auxiliary or modal verb, that verb normally comes before the subject in a corresponding WH question.
Statement:
The organizers have moved the event to the community hall.
Question:
Where have the organizers moved the event?
The auxiliary have comes before the organizers.
Modal verbs follow the same pattern:
When can visitors collect their membership cards?
Why should tenants keep copies of their inspection reports?
When be is the main verb, it also comes before the subject.
Where is the nearest accessible entrance?
How was your first day at the new school?
You don’t need to add do to these questions.
WH Questions with Do, Does, and Did
Some WH questions need an extra auxiliary verb.
When a statement has an ordinary lexical verb in the simple present or simple past, English generally uses do, does, or did to ask about something other than the subject.
Statement:
The bakery opens at six.
Question:
When does the bakery open?
The main verb changes from opens to open because does already carries the present-tense marking.
In the past tense, the pattern works similarly.
Statement:
The council rejected the application because the drawings were incomplete.
Question:
Why did the council reject the application?
After did, the main verb takes its base form.
Incorrect: Why did the council rejected the application?
Correct: Why did the council reject the application?
The past tense is already expressed by did.
When the WH Word Is the Subject
There is an important difference between asking who performed an action and asking who or what received it.
Consider:
A cyclist reported the damaged traffic signal.
To ask who reported it:
Who reported the damaged traffic signal?
Here, who replaces the subject a cyclist. We don’t normally add did to form this neutral question.
Now suppose you want to know what the cyclist reported.
What did the cyclist report?
Here, what replaces the object, so the question uses did.
Consider another pair:
Who collected the missing parcel?
What did the courier collect?
The first asks about the person performing the action; the second asks about the thing collected.
What About Negative Subject Questions?
Subject questions can contain do, does, or did when the negative construction requires it.
Compare:
Who received the invitation?
Who didn’t receive the invitation?
In the first question, who is the subject, and ordinary do-support is unnecessary.
In the second, didn’t forms the negative past-tense question.
The auxiliary is needed for the negative construction, not simply because the sentence is a question.
Subject questions can also contain auxiliaries required by their tense:
Who has completed the final inspection?
Here, has is part of the present perfect construction.
WH Questions with Prepositions
Some WH questions use prepositions such as to, for, with, about, and from.
In everyday English, the preposition often appears at the end of the question.
Who did you leave the spare key with?
What are the residents concerned about?
Which company does your brother work for?
Where did the parcel come from?
These are natural, grammatically correct English questions. Ending a question with a preposition is not automatically wrong.
You may also encounter more formal constructions in which the preposition comes before the WH expression.
Compare:
Who did you send the invitation to?
Whom did you send the invitation to?
To whom did you send the invitation?
All three are grammatical. The first is common in everyday conversation, while the last is especially formal.
In modern English, who is widely used as an object in questions. You don’t need to replace it with whom simply because it refers to an object.
However, when a preposition comes directly before the question word in this kind of formal construction, whom is the standard form for a person.
Correct: To whom should the documents be addressed?
Not standard in formal English: To who should the documents be addressed?
For things, a formal question may use which after a preposition:
To which address should the documents be sent?
WH Questions in Indirect Questions
A WH question can become part of a longer sentence, especially when someone is asking politely, reporting a question, or explaining what they don’t know.
Compare:
Direct question:
Where did the technician store the equipment?
Indirect question:
Do you know where the technician stored the equipment?
Inside the longer sentence, the subject comes before the verb.
We say:
Correct: Could you explain why the inspection was delayed?
Incorrect: Could you explain why was the inspection delayed?
The difference also affects punctuation.
Can you tell me when the replacement parts will arrive?
This is a question, so it ends with a question mark.
The supervisor asked when the replacement parts would arrive.
This is a statement containing an embedded question, so it ends with a period.
WH Questions Used to Check Information
In conversation, someone may repeat part of what they’ve just heard because they missed a detail or found it surprising.
Imagine this exchange:
I sent the revised report to Daniel.
You sent it to who?
The second speaker may not have heard the name clearly, or perhaps didn’t expect Daniel to receive the report.
A neutral question would be:
Who did you send the revised report to?
The first version keeps much of the original statement’s word order and highlights the detail being questioned. This is a conversational checking or echo question.
You may hear something similar when a person reacts to an unexpected time:
The exhibition closes at four tomorrow.
It closes at what time?
In speech, emphasis and intonation help convey whether someone is asking for clarification or expressing surprise.
Practice: Choosing and Forming WH Questions
These exercises test whether you can choose the appropriate question word, form a grammatical question, and ask for the information you need.
Exercise 1: Choose the Correct Question Word
Choose the most suitable word or phrase for each question.
- _______ owns the old farmhouse at the end of the road?
(Who / Whose) - _______ did the restoration work begin?
(When / How long) - _______ of these two designs received approval?
(What / Which) - _______ are the emergency systems inspected?
(How often / How far) - _______ did the researchers withdraw their original conclusion?
(Why / Where)
Exercise 2: Correct the WH Questions
Each question contains a grammatical error. Rewrite it correctly.
- Where the conference will take place?
- Why did the manager postponed the meeting?
- Who did discovered the missing records?
- Can you tell me where is the nearest charging station?
- How many equipments did the laboratory purchase?
Exercise 3: Ask for the Missing Information
Read each situation and write the WH question that asks for the specified information.
1. A school installed new solar panels in August. You want to know the month in which the installation took place.
2. Someone accidentally deleted the shared project folder. You want to know who deleted it.
3. The hotel purchased four new luggage trolleys. You want to know the number purchased.
4. A customer collected a replacement laptop from the service center on Friday. You know who collected it and what they collected, but you want to find out the location.
5. A customer returned a laptop because its battery would not hold a charge. You want to know the reason for the return.
Exercise 4: Which Question Fits the Situation?
A colleague tells you:
The final report was sent to the finance manager yesterday.
You want to know how the report was delivered, such as by email or through a shared platform.
Which question would ask for that information?
A. Who received the final report?
B. When was the final report sent?
C. How was the final report sent?
D. Why was the final report sent?
Answers and Explanations
Exercise 1
- Who owns the old farmhouse at the end of the road?
Who asks about the person who owns it. - When did the restoration work begin?
When asks about the starting time. - Which of these two designs received approval?
Which identifies an option from a specified set. - How often are the emergency systems inspected?
How often asks about frequency. - Why did the researchers withdraw their original conclusion?
Why asks for a reason.
Exercise 2
- Where will the conference take place?
The modal will comes before the subject. - Why did the manager postpone the meeting?
Use the base verb postpone after did. - Who discovered the missing records?
Who is the subject, so ordinary do-support is unnecessary. - Can you tell me where the nearest charging station is?
The embedded question uses subject–verb order. - How many pieces of equipment did the laboratory purchase?
Equipment is normally uncountable. Use a countable expression such as pieces of equipment when asking about individual objects.
Exercise 3: Possible Answers
- When did the school install the new solar panels?
- Who deleted the shared project folder?
- How many luggage trolleys did the hotel purchase?
- Where did the customer collect the replacement laptop?
- Why did the customer return the laptop?
Other answers may also be correct if they ask for the specified information and follow standard English question structure.
Exercise 4
C. How was the final report sent?
This asks about the method of delivery. The other options ask about the recipient, time, or reason. All four are grammatical, but only option C requests the information needed.
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