We have finished the homework.这里的have 可不可以用 had 意思有什么变化吗?

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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 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?
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• We have finished the homework.这里的have 可不可以用 had 意思有什么变化吗?
• among civilized people it was once thought that ginger root by some magical power could improvethe memory.这句话前部分可以这样翻译吗：在文明人中曾经以为……“　it前面不用加什么连接吗?　　这句话中的by是什么意思?为什么用by?可以用其它词代替吗?这里是“有魔法”的意思,能用have吗?　　　　could前面也不要连接词的么?　　不懂啊~~~~
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