We planted these trees last year.怎么改成被动句,求答案
问题描述：
We planted these trees last year.怎么改成被动句,求答案
答
A new bridge was built over the river last year by us. A new bridge was built over the river last year (by us). A new bridge
答
These trees were planted by us last year
答
These trees were planted (by us) last year.
这里by us假如说话双方都知道的情况下,可以省略的.
答
These trees were planted last year.