有几句话的语法我不明白,

有几句话的语法我不明白,
1.He would just drop the books in the outside return box.
would just,drop分别是什么意思
2.he would be on his way to the playground to meet Eric.
would
3.As the sun began to set
4.At last he could see
这是什么句子,

1,虚拟语气 他刚要 drop在此句译为放下
2.虚拟语气 意思是:他在去见Eric的路上.因为是猜测的,不清楚他是不是正在路上,所以用would be.
3.看具体语境来翻译,由于
4.过去式的句子 最后他终于能看见东西了(假如语境是他之前瞎掉了)