When it comes to wishing someone a happy birthday, there are plenty of alternatives to saying "greet you a happy birthday." For example, you could simply say "happy birthday," "many happy returns," or "have a wonderful day." Other options include "wishing you all the best on your special day," "may your day be filled with joy and happiness," or "sending you love and birthday wishes." You could also get creative and use a birthday pun, such as "hope your birthday is a piece of cake!" Whatever greeting you choose, make sure to personalize it and show the birthday person that you truly care about them on their special day.