请英语语法高手帮忙
问题描述：
请英语语法高手帮忙
1. The book was sent to me by him
“..to me by him ”to me 为什么不放在 by him 后面.
2. The letter was being written by me when you came.
“..by me when you came”为什么when you came不在by me 前面呢?
3. I have been helped by him all my life.
“.. by him all my life”为什么all my life不放在 by him前面?
请问像 By这样的介词位置放在哪里有什么规则吗? 有时候用起来有点模糊.请高手帮忙分析,要具体的讲解哦,不要复制->粘贴的（我看都不看）. 让我能彻底明白的追加100分.谢谢
答
很简单,1 to me跟前面的the book was sent...一个完整的句子,而by是介词不能将一个完整句子拆开呀,放在最后加宾语是最合适的用法,像楼上的说的 send sth to sb,后面加by 表示通过某某,被某某.2 当一个一句带时间状语...