生日birthday可数吗

　　What did you get for your birthday?

　　你收到什么生日礼物了？

　　The birthday card arrived three days late.

　　生日贺卡晚到了三天。

　　What are you giving your father for his birthday?

　　你打算送给你父亲什么生日礼物？

　　I cut a piece of birthday cake for them all.

　　我给他们每个人都切了一块生日蛋糕。

　　She broke her leg last week ─ and on her birthday too!

　　她上星期把腿摔断了，而且还是在她生日那一天！