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1 five years passed (before)he eventally found his missing s

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1 five years passed (before)he eventally found his missing son in a remore fishing village.
为什么这里不可以填when呢?
2 the whole group took part in thr discussion,each member (having)the responsibility of leading one meeting.
为什么填having?
1时态 5年与he 动作关系
2简单句 加 简单句 不用连词不成立 因此用独立主格each member (having)the responsibility of leading one 而不用动词had