名词作定语通常说明被修饰词的作用,类别,材料,时间等.如
an English book.a gold watch./a paper flower evening news.
形容词作定语主要说明被修饰词的特征,品质等,如
a golden watch a beautiful girl a big room
以上这些形容词还可作表语,如 the watch is golden
the girl is beautiful
the room is big.而上面那些名词作定语不可以这样说.