求这句英语的语法分析the only boat i have happened to notice was a small sloop tacking out of the east river night before last on the ebb tide 这里面这个before last on the ebb tide last on 在这里做什么结构?

问题描述:

求这句英语的语法分析
the only boat i have happened to notice was a small sloop tacking out of the east river night before last on the ebb tide
这里面这个before last on the ebb tide last on 在这里做什么结构?

before last 是和night连在一齐用的,night before last,就是前晚;on the ebb tide,是“在落潮时”的意思.