on the first day i went to school 请问 i went to school 充当 什麽

on the first day 是做句子的时间状语部分,后面的是真正的句子主语啊,其中I做主语,went to作谓语动词,school做宾语。如果是,on the first day when i went to school则是定语从句。意思是,我上学的那个第一天。如果是定语从句得有词引导,副词when ,how 不可省,that 作宾语时可以省。