生日祝福语是向生日的人表达美好祝愿的话语，在英语中，可以使用以下简单的句子来表达生日祝福：
1、Happy birthday!(生日快乐！)
2、Wishing you a very happy birthday!(祝你生日非常快乐！)
3、May your birthday be filled with joy and happiness!(愿你的生日充满欢乐和幸福！)
4、Have a wonderful birthday!(祝你度过一个美好的生日！)
5、Here's wishing you the best things in life on your birthday!(祝你生日时拥有生活中最好的事物！)
6、Enjoy your special day and all the blessings that come with it. Have a great birthday!(享受你的特殊日子，祝愿你一切顺利，生日快乐！)
7、May your birthday be as amazing as you are. Happy birthday!(愿你的生日和你一样精彩，生日快乐！)
8、On this special day of yours, I just want to say that I'm lucky to have you in my life. Happy birthday!(在这个特别的日子里，我只是想说我很幸运能有你在我的生命中，生日快乐！)
9、Wishing you love, happiness and prosperity on your birthday and always. Happy birthday!(祝你生日和永远都充满爱、幸福和繁荣，生日快乐！)
10、Sending you love and warmest wishes for a very happy birthday. Have a great day today!(送给你爱和最温暖的祝愿，祝你生日非常快乐，今天过得愉快！)
