过去进行时的主动语态变被动语态怎么变 最好有例句

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过去进行时的主动语态变被动语态怎么变 最好有例句

过去进行时的主动语态变被动语态怎么变 最好有例句
过去进行时的主动语态变被动语态怎么变 最好有例句

过去进行时的主动语态变被动语态怎么变 最好有例句
过去进行时的主动语态是:were / was doing
变成被动语态是:were / was been doing
例如:
He was planting a tree at 10:00 yesterday .
被动语态:A tree was been planting by him at 10:00 yesterday .