【急!】请把以下句子变成被动语态.

Our compositions have been gone over by the teacher.
Is the film being talked about by the students?
By whom was the bus being waited for?
Who is being talked by you?
Who was met by you in the park?
Had your keys been locked by you 你确定是对的？放心吧，肯定正确。我从不答没有把握的题目。为什么3. 4. 不一样呢？我觉得应该用By whom ，Who也可以吗？作宾语时who 和 whom可以替换，但是如果用于介词后 只能用 whom ，不能用 who。 3 中 whom 作介词 by 的宾语，所以 只能用 whom4 中who 作主语