把people place litter baskets under the trees改为被动式

把people place litter baskets under the trees改为被动式

题目
把people place litter baskets under the trees改为被动式
people place litter baskets under the trees改为现在完成时、一般过去式、一般将来时的被动语态
答案
现完:Litter baskets have been placed under the trees by people.
过去:Litter baskets were placed under the trees by people.
将来:Litter baskets will be placed under the trees by people.
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