|Structures of questions|
|If there is an auxiliary (helping) verb (be, have, can, will, etc), we put it before the subject (he, she, I, etc).||Is anybody in the office?
Have you ever visited London?
What time will they be here?
|If there is no auxiliary (helping) verb, we put do, does or did before the subject.||Do you know my older brother? Did he come in time?|
|We put wh- words (when, where, why, who, how, etc.) at the beginning of the question.||How long have you been waiting for me?
Where is their office?
Which colour do you like best?
|We don't use do, does or did when we use what, which, who or whose as the subject.||What happened to you?
What did happen?
Who told you about it?
Who did tell you?
|Questions – common mistakes|
|Common mistakes||Correct version||Why?|
|What meant you by that?
You like this film?
|What did you mean by that?
Do you like this film?
|If there is no auxiliary (helping) verb, we put do, does or did before the subject.|
|Where you are going this afternoon?
You did read the letter?
|Where are you going this afternoon?
Did you read the letter?
|We put an auxiliary verb (is, are, did, does, etc) before the subject.|
|Who did give you the information?||Who gave you the information?||We don't use do, does or did when we use what, which, who or whose as the subject.|
|Does he knows your sister?
Where will she studies?
|Does he know your sister?
Where will she study?
|When there is an auxiliary verb, the main verb is in the infinitive form.|
|Can you tell me where can I buy a good camera?||Can you tell me where I can buy a good camera?||Word order in indirect question is the same as in a normal sentence: subject + verb|