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过去完成时和一般过去时怎么分辨?

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过去完成时和一般过去时怎么分辨?
比如说:
Mr Smith died yesterday.He had been a good friend.
这句中,为什么不可以用"He was a good friend.
过去完成时是“过去的过去”发生的事,如:
He had been a good friend before that year.在那年之前他是一个好朋友.
一般过去时是“过去”的事,句中往往有一个过去的时间.如:
Mr Smith died yesterday.
He was a good friend when I was in the country.当我在乡下时,他是一个好朋友.
也许Mr Smith died yesterday.He had been a good friend.是两个连续的句子.那么第一句是讲“昨天”发生的事,第二句是讲“昨天之前”发生的事.
不明白的再问哟,请及时采纳,多谢!