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 .