将一个句子改为被动语态结构,如果句子开头出现了人名,中间是例如:wrote a letter to sb.

问题描述:

将一个句子改为被动语态结构,如果句子开头出现了人名,中间是例如:wrote a letter to sb.
之后是(例如):yesterday或者是last night 之类的,被动语态该怎么改?是不是开头的人名前加个by然后放到最后?

例如 :
Mary wrote a letter to Emily last night.
被动语态结构:
A letter was written to Emily by Mary last night.by mary和last night的位置可以调换吧?我觉得应该都可以的应该都可以的, 但通常时间 last night 放在後面.