Ответы на вопрос:
Past perfect обозначу как p1 present perfect - p2 1. p1 - it had presented the mechanism for survival for years.p2 - it has just presented the mechanism for survival.2.p1 - they had been able to carry out the task of production by monday. p2- they has just been able to carry out the task of production. 3. p1 - it had been possible to group these structures into four broad categories by that time. p2 - it has just been possible to group these structures into four broad categories. 4. p1 - these methods had been based on tradition for a long time. p2 - these methods has already been based on tradition. 5. p1 - a son had followed in the footsteps of his father and used the same skills and tools by the time he was 20 years old. p2 - a son has already followed in the footsteps of his father and used the same skills and tools. 6. p1 - the distribution problem had been solved in a similar manner for a long time. p2 - the distribution problem has already been solved in a similar manner. 7. p1 - they had received shares according to an ancient custom for 5 years. p2 - they have just received shares according to an ancient custom. 8. p1 - tradition had played some part in economical processes. p2 - tradition has already played some part in economical processes.
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