Question Structure

The basic structure of a question is:

auxiliary verb + subject + main verb

Look at these example sentences. They all have the auxiliary verb before the subject:

  auxiliary verb subject main verb  
  Do you like Mary?
  Are they playing football?
  Will Anthony go to Tokyo?
  Did he leave early?
Why did he leave early?
When will he return?  

Exception! For the main verb be in Present Simple and Past Simple, there is no auxiliary verb. Look at these example sentences. They all have the main verb before the subject:

  main verb be subject  
  Am I wrong?
  Are they Thai?
  Was it hot outside?
Why were you late?