Merry Christmas in Philippine is Maligayang Pasko!
Maligayang Pasko (Ma-lig-a-yung Pas-co)
Maligayan Pasko!
You say "Merry Christmas" and not "Merry Birthday" because it is inproper grammerThere is no grammatical problem with saying "merry birthday".Besides, I wouldn't be taking grammar hints from someone...
Feliz Navidad.
Feliz Navidad
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