Did- Did he go to the park?- Refers to something done in the past. Does- I hate when he does that.- Refers to something someone else is doing (present). Do- This is what I want to do.- Refers to performing an action. Who it comes from in unspecified
In the simple present tense, do will function as an auxiliary to express the negative and to ask questions. (Does, however, is substituted for third-person, singular subjects in the present tense. The past tense did
