In English, there are seven Wh questions. What- When – How- Who- Why – Which – Where.
We use them to ask information. The answer to them is not yes or no. for answering the question of using these words we have to make full sentences.
How to make a Question
We usually form Wh-question with wh + an auxiliary verb ( be, do or have) + subject + main verb or with Wh + a modal verb + subject + main verb.
Where do you live?
Why didn’t you call me?
Pay attention that you can make a question sentences without an auxiliary verb.
When, what, who, which or whose is the subject or part of the subject, we do not use the word order subject + verb.
Who sold this?
Who owns this bag?
With Wh-question we can make a question that asks about information, the answers aren’t yes or no. we expect an answer which gives information.
Where is the dishwasher?
It’s in the kitchen.
How old your grandfather?
He is about eighty-nine.
Also, we can add emphasis to wh- questions in speaking by stressing the auxiliary verb do. We usually do this when we have not already received the information that we expected from an earlier question, or to show strong interest.