1.表示某人多少岁“生日”，要用序数词而不用基数词。

如：Today is my grandfather’s sixtieth birthday. 今天是我爷爷的六十大寿。

2.注意以下与动词的常用习惯搭配：

celebrate one’s birthday 庆祝生日

observe [keep] a birthday 过生日

complete one’s 30th birithday 满30岁

3.通常用于祝贺生日的用语。

如：Happy birithday to you. 祝你生日快乐。

Many happy returns of your birthday. 祝您长寿。

Many happy returns of the day. 祝您长寿。