如何使用，生日快乐英语怎么写？

all my friends join me in wishing you a happy birthday.

1、生日快乐英语写法是：happy birthday。

2、例句：

all my friends join me in wishing you a happy birthday.

我的所有朋友和我一道祝你生日快乐。

i am having a happy birthday！

我过了个开心的生日！