快乐用英文怎么说生日快乐用英文怎么说

"Happy" 用英语表示为 "happy"。

"Birthday" 用英语表示为 "birthday"。

"Happy birthday" 用英语表示为 "happy birthday"。

这个短语起源于英语中的生日祝福语，表示祝福对方生日快乐。

例句：

"Happy birthday, John! Wishing you all the best on your special day." (约翰，生日快乐！祝你在你的特殊日子里一切顺利。)
"Sending you lots of love and happy birthday wishes on your special day." (在你的特殊日子里给你发送很多爱和生日祝福。)
"Wishing you a very happy birthday and a great year ahead." (祝你生日快乐，前途一片光明。)