When is your birthday ?   August 1st .   Do you usually have a birthday party ?   Yes , we do.My parents prepare dinner for me .   What would you do at the party ?   We sing " Happy Birthday " at the party and have birthday cakes .   Do you know when people began to sing the song " Happy Birthday " ?   Well , I don't know .   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 .   So the ' Happy Birthday ' song has been popular since then ?   Yes , actually , the song has been sung since its publication in 1932.People all over the world have sung it in many different languages . 