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！