作主语 the first of october is our national day 作宾语 she likes the second 作表语 he was the first to come 作定语 her room is on the fourth floor.作同位语 liming,the first,is here.作状语 序数词相当于名词和形容词的句法功能 一般不能用作状语 其他数词可以.不敢硬造句,以免误人子弟.