问题描述： We saw some boys playing football怎么改被动 1个回答 分类：英语 2014-11-19 问题解答： 我来补答 把原来的宾语提前当成主语,而原来的主语用by连接并且变成宾格,所以,Some boys were seen playing football by us 展开全文阅读
