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