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 .是的，刚才不小心写错了，这是不好意思。应该是 was / were being done .例如：He was planting a tree at 10：00yesterday .被动语态：A tree was beingplanted by him at 10:00 yesterday .