"My birthday is on May 2nd."
"May" 是五月的意思，在英语中是一个名词。而 "2nd" 是序数词形式，表示第二个。
例句：
"I was born on May 2nd, 1995." (我生于1995年5月2日。)
"May 2nd is a special day for me because it's my birthday." (5月2日对我来说是特别的一天，因为那是我的生日。)
"I'll be celebrating my birthday on May 2nd this year." (今年我将会在5月2日庆祝我的生日。)