Questions And Auxiliary Verbs

46. Questions (1)

In Questions, we usually put the first auxiliary verb(AV) before the subject(S)

   t)  S + AV   ->     AV + S
       I can    ->     Can I?
   ex) What can I do?

B. In simple present questions, we use do/does(do/does) 
   t)  you live  ->  do you live?
   ex) Do you live near here?

   In simple past questions, we use did
   t)  you sold  ->  did you sell?
   ex) Did you sell your car?

   But do not use do/does/did if who/what/which is the subject of the sentence.
   Compare :
   ex1) who object 
        Emma phoned somebody. -> Who did Emma phone?
   ex2) who subject
        Somebody phoned Emma. -> Who phoned Emma?

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