偶尔看到有老师说：
通常来讲，用作定语的过去分词短语所表示的时间应与句中的谓语动词一致，但有时可能表示不一样的时间：
The only car repaired by the mechanic is mine.
这句话中的repaired可能是that is being repaired，但也会意为that is repaired, that will be repaired 或 that was repaired, 当然，确切意义一般要从特定的上下文可以看出。
我有几个方面疑惑：
1）用作定语的过去分词短语所表示的时间应与句中的谓语动词一致 - 这种说法对吗？
2）上句中的repaired，到底有几种理解？我觉得可以理解为that is/was/has been repaired, 不可以理解为that is being repaired, 也不可以理解为that will be repaired.
麻烦老师解析！
The only car repaired by the mechanic is mine.
过去分词作定语可以表示习惯，也可以表示事件。前者转换为定语从句用一般目前时，后者转换为定语从句，则用一般过去时或目前完成时。无论怎么样，它不可能表以后或进行，由于以后意义用不定式的被动式 to be done，进行意义用目前分词的被动式 being done。
The only car repaired by the mechanic is mine.
= The only car that was/has been repaired by the mechanic is mine.
The only car to be repaired by the mechanic is mine.
= The only car that will be repaired by the mechanic is mine.
The only carbeing repaired by the mechanic is mine.
= The only car thatis beingrepaired by the mechanic is mine.
过去分词作定语，可以表示习惯意义，举例：
The products produced by this company are always very popular.
= The products which are produced by this company are always very popular.
