   neutral   What would you do at the party?     neutral   We sing " Happy Birthday " at the party and have birthday cakes.  
    neutral   Do you know when people began to sing the song " Happy Birthday "?     neutral   Well, I don't know.  
    neutral   Let me tell you the story.In 1892, Patty Smith Hill and Mildred Hill wrote a song called " Good Morning to you ". But later someone added the words " Happy Birthday " to their tune.     neutral   
 When it was sold for one hundred dollars, some said the song wasn'worth such high price because
 Then, in early twenty century'happy Birthday ’ s were popular all over. In the