嗨，这么简单。明白简单的告诉你：
翻译：When were you born？你是在什么时候出生的？
既然问在什么时候，就要说I was born on Febuary 19th 2003.我出生在2003.219.要用“在”
When is you birthday？你的生日是几号？就应说It’s February 19th.
他是2.19就用不着加“在”！
be born on 是固定短语,born是不及物动词,后面接名词时必须加介词
我生于...当然不能少介词，你可以看成是一个词组。而IT'S后面可以省略，
因为born的那句是过去式，而it's后面是将来时。
应为born后的日期精确到了几号，而几号的前面用介词on
问句里用的是is所以用is回答
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