Question

用过去完成时造句，用被动语态，词汇尽量简单

Answer 1

Many cars had been produced by this factory.许多汽车被这个工厂制造
He had been told many times not to be late. 他被多次告诉不要迟到
A house had been built near our school. 一个房子被建起在我校附近
We had been warned to be careful of cars. 我们被警告小心汽车
The meeting had been canceled. 会议（已经）被取消
我用了基本上最简单的词了 行不行？？

Answer 2

主动：
We had planted many trees here since 2010.
被动：
Many trees had been planted here by us since 2010.