He had been presented the Oscar Award before he starred this film.
He had been found cheating in the exam before the exam came over.
My wallet had been stolen before I found it.
The big tree had been cut down before the policeman found it.
The environment had been broken before human beings found this serious problem.
become/hold/happen/take place/join或主动句中机物动词的宾语为反身代词或互相代词时没有被动
主动句过去完成时的被动语态：He wears a blue shirt
被动语态：A blue shirt is worn by him
被动语态
现在进行时：be+being+done（动词过去分词）
一般：was/were+done
一般现在时：am/is/are+done
将来时：will+be+done
be going to+be+done
现在完成时：have/has been+done
情态动词被动语态：情态动词+be+done
什么时候用被动语态
1 不知动作被谁所做
2 不必说出动作是谁做的
3 为了突出或强调动作的承受者
机物动词：后面可以直接加名词的动词 如：wear(+名词)
不机物动词：后面不可以直接加名词的动词 如：look(+at+名词）
不机物动词不可以变被动
结构为主系表的句子不可变被动
have表有时句子不可变被动
become/hold/happen/take place/join没有被动语态
主动句中如果机物动词的宾语为反身代词或互相代词则不饿可变为被动
其实你只要先把过去完成时写出来，也就是had done。
其中，过去完成时：
1、表示过去某一时间或动作以前已经发生或完成了的动作。它表示动作发生的时间是“过去的过去”，侧重事情的结果
2、表示发生在过去的动作对过去的某一点造成的某种影响或结果，用来指定在另一个过去行动之前就已经完成了的一个事件，侧重事情的结果。
参见/view/201153.htm?fr=aladdin
然后再对done做被动语态的转换改成had been done，就构成了你说的过去完成时被动语态。
主语(动作承受者) + was / were + 过去分词(+ by + 施动者)构成
句型格式：was / were + done
I was taught by Miss Zhao last year.
去年，我是由赵老师教的。
Those letters were wirtten by a famous writer.
那些信是由一位有名作家写的。