过去完成的英文

例句与用法

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1. For three weeks , for a long time
   可用于现在过去完成时或过去时的句子里
2. They said that production costs had been reduced
   （过去完成时）他们说生产成本已经下降了。
3. He told me that there had been an argument between them
   （过去完成时）他告诉我他们之间有过一场辩论。
4. Past perfect continuous tense
   过去完成进行时
5. Past and past participles
   过去或过去完成式