Detective Interrogative checked his morning assignment the minute he arrived at work. He suspected that there might be an important job, and he was right! 

DO, the auxiliary of the simple tenses, was not being used correctly by one of the citizens of the Land of English. 

Detective  Interrogative's job was to ask questions and to find out who was misusing DO.        

Detective Interrogative immediately consulted his partner, Detective Negative. Detective Negative's job was to find information about the misuse of DO.

"Do you think this is serious?," Interrogative asked Negative.   

"I don't take this lightly," said Detective Negative. "We have a breakdown of grammar and order! We don't have any choice but to find the criminal."