“生日快乐”是我们在庆祝生日时最常用的祝福语。在英语中，最常见和最普遍的表达方式是“Happy Birthday!”。这句话简洁明了，适用于各种场合和对象，无论是朋友、家人还是同事，使用“Happy Birthday!”都不会出错。如果你想使祝福更加个性化和特别，以下是一些不同的表达方式供你参考。
基础版：
Happy birthday!
Happy birthday to you!
Happy birthday to my dear!
创意版：
Many happy returns of the day!
Birthday greetings to the apple of my eyes.
Hoping all the best things will always come your way.
Happy birthday to my best friend!
Wish you all the best!
Wish you have a super time!
Happy belated birthday!
You are 18 years old. That’s something to be proud of.
更正式的表达：
Wishing you a very happy birthday.
I wish you all the best on your birthday.
Best wishes on your special day.
带有愿望的表达：
Happy birthday! May all your wishes come true.
Wishing you a wonderful birthday filled with joy and happiness, and may all your dreams come true!
其他语言的生日快乐：
法语：Bon Anniversaire
德语：Herzlichen Glückwunsch zum Geburtstag
日文：誕生日おめでとうございます
俄语：С днем рождения!
韩语：생일 축하합니다
葡萄牙语：Feliz Aniversário!
西班牙文：¡Feliz Cumpleaños!
以上这些表达方式不仅限于口语，也可以用于生日卡片或短信中，让你的祝福更加独特和有意义。