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I have seen this film.与I had seen this film.区别?

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I have seen this film.与I had seen this film.区别?
这两个句子分别怎样翻译?
还有
The desk is broken(当break的过去分词)
The desk was broken(同上)
怎样区分?怎样翻译?
(is am are)+过去分词与(was were)+过去分词怎样区别?
I have seen this film.与I had seen this film.区别?
I have seen this film.强调过去的动作对现在的影响和造成的结果
I had seen this film表示过去的过去
The desk is broken现在的状态
he desk was broken过去的状态