来源:学生作业帮 编辑:大师作文网作业帮 分类:英语作业 时间:2024/09/30 23:31:44
什么情况下 by短语可省(在被动语态中)
在被动语态中,by+主语.当主语为不定代词(someone,somebody)时,主语是可以省略的.如:The piramids had been built over 2900 years ago(主语被省略)
如果主语是人的话,则不能省略:
The building is being built by those workers.
I was invited by him.
我目前就知道这些,