Keywords: to
Sign Definition
As Modifier
                                            1. Used before or after a verb to mean the action takes place before a particular time as measured by a clock, the clock hour is already known by you and your conversational partner.
                                          
                                          
                                        
                                            2.  Used with a time sign (a number of minutes) to mean 'the given number of minutes before the hour'.
                                          
                                          
                                         
                  
                      