Answer by  
                                                                                          HelpChat (494)
                                                            
                          
                          
                                                          Verb tenses indicate when an action happens.  Shifting the verb tense is allowable if it will make the time-frame of the verb match the event.  For example: "I need to run to the store," indicates the future.  When you get back you might say that, "I ran there."