关于复合形容词我在书上看的复合形容词可由“形容词+名词”和“形容词+名词+ed”构成,其中“形容词+名词”又可构成复合名

关于复合形容词我在书上看的复合形容词可由“形容词+名词”和“形容词+名词+ed”构成,其中“形容词+名词”又可构成复合名词,大家请看下面这个改错题：As long as poor people,who in general are colored,are in confilict with richer people who in general are lighter skin,there's going to be a constant racial conflict in the world.书上答案是skin改成skined,但是“形容词+名词”不是也可构成复合形容词么,很迷惑,