Her brother was born blind (= was blind when he was born) .blind是主语补足语吗？

解答：关于blind是什么句子成分，有不同的观点。

1 传统语法有认为是主语补足语的。理由是blind是形容词，说明主语的特征。

2 传统语法也有认为是形容词作状语的，理由是，blind解释的是谓语was born的时候的情况，和谓语有关。类似的情况如：He died young. 

3 现在语法认为blind是无动词分句作状语。

John Wayne was born Marion Michael Morrison (=that was his name at birth).

解答：和上句的情况类似，Marion Michael Morrison作什么成分有不同观点。

1 传统语法有认为Marion Michael Morrison是主语补足语的。

2 传统语法也有认为是名词作状语的。类似的情况如：He died a hero. 

3 现代语法认为Marion Michael Morrison是无动词分句作状语。

born很少用于主动语态吗？

解答：动词bear作“生孩子”解的时候是很正式的用词。过去式为bore，过去分词为born和borne。born只用于被动语态，但不能和by连用。

He was borne by a British woman.

She has borne him 3 sons. 她给他生了三个儿子。

He was born in Paris. 

born还可用作形容词。 He is a born sportsman.