Bonsoir je n'ai rien compris à cette exercice pouvez-vous m'aider svp

Did you tell the police ?
Did she phone her friend ?
Did Mike by a new pair of trainers ?
Did Colombus discover America ?
Did the children go to the zoo?
Did you do your homework ?

Did you tell the police?
does she phone ....?
does Mike buy...?
did Colombus discover..?
does the children go to...?
did you do your ...?