Keywords: who, whom, whose, someone, whoever, whomever
Sign Definition
As a Noun
                                            1.  A person in the most general sense (without saying who they are exactly). English = someone.
                                          
                                          
                                        
                                            2.  A person who does something whose identity does not matter or is not known. English = whoever.
                                          
                                          
                                        
                                            3.  A person who has something  done to them whose identity does not matter or is not known. English = whomever.
                                          
                                          
                                        As Modifier
                                            1.  Used immediately after a noun sign and before a verb sign to make absolutely clear that the person or thing named in the noun is the actor in the action named in the verb. English = who.
                                          
                                          
                                        
                                            2.  Used immediately after a noun sign and before another noun sign followed by a verb sign to mean that the first noun has the action of the verb done to it by the second noun. English = whom.
                                          
                                          
                                        As Question
                                            1.  Used to ask a question about someone's name or the identity of the person who performs the action of the verb in the sentence, or undergoes the action. English = who, whom, which one of you.
                                          
                                          
                                        
                                            2.  Used immediately next to a noun to ask questions about the name or identity of the person that the thing belongs to or relates to. English = whose.
                                          
                                          
                                         
                  
                      