有这样几种说法:
Happy birthday to myself。(祝我生日快乐)
Happy birthday to me.(祝我生日快乐)
I wish a happy birthday。(祝我生日快乐)
Best wishes to me。(给我最好的祝福)
关于birthday的几个参考例句:
He’s been drinking a little in anticipation of the Queen’s birthday.
他这阵子爱喝上两口,说是为了预祝女王生日。
Happy [birthday], dear friend.
生日快乐,亲爱的朋友。