be born unlucky 为什么不用 be born unluckily

be born unlucky 为什么不用 be born unluckily

be born后可跟形容词、名词或不同的介词

be born + 形容词
eg. She was born happy. 她生来就很幸福
be born + 名词
He was born Chinese. 他生为中国人。
be born + 介词 通常是be born + in +地点； be born + on +具体的某一天
Xiaoming was born in Hebei Province on February 12，1999． 1999年2月12日小明生于河北省。
Karl Marx was born on May 5，in Trier． 卡尔·马克思5月5日生于特里尔。
be born + with， 表示"天赋；命运"。
He was born with a good memory. 他生来记性就好。
be born+ to do, 表示"生而为......；生来就是"。
She was born to succeed in life. 她生来注定会成功。

具体为什么be born 后面加的是形容词而不是副词，是因为这句话里的动词是be动词，本句中要修饰的是be 的一个状态，而不是born的状态，它相当于一个系表结构。

He/she was born unlucky 相当于 He/she was unlucky once he/she was born.
说的是他/她生下来之后会维持很长时间的一个状态，而不是出生那一刻的状态。