If there had not been a hard layer of rock beneath the soil 这句话为什么要用过去完成时呢?

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• if there had not been a hard layer of rock beneath the soil,they would have completed the job in a few hours.这句话为什么要用过去完成时呢?为什么不用一般过去式呢?改成这样 if there were not a hard layer of rock beneath the soil,they would have completed the job in a few hours这样不是更好吗?为什么呢?用过去完成时他语境更加强调了什么呢？
• if there had not been a hard layer of rock beneath the soil,they would have completed the job in a hours.这句话我有2处不懂.1.if there had not been这里的had是作“有”的意思吗 had not 是否定形式“没有”的意思?如果这样的那后面为什么要加been呢?直接if there had not a hard layer of rock beneath the soil这样不就可以了吗?2.they would have completed the job in a hours,这句话我没能理解,应该怎么划分呢?这里的have什么意思呢?是什么用法?
• If there had not been a hard layer of rock beneath the soil 这句话为什么要用过去完成时呢?they would have completed the job in a few hours.
• if there had not been a hard layer of rock beneath the soil,they would have completed the job in a few hours.这句话为什么要用过去完
• If there had not been a hard layer of rock beneath the soil 这句话为什么要用过去完成时呢?
• if there had not been a hard layer of rock beneath the soil,they would have completed the job in a hours.这句话我有2处不懂.
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• 2分之1b-3分之2b+b=3分之2X6-1