问题标题：
把peopleplacelitterbasketsunderthetrees改为被动式peopleplacelitterbasketsunderthetrees改为现在完成时、一般过去式、一般将来时的被动语态
问题描述：
把peopleplacelitterbasketsunderthetrees改为被动式
peopleplacelitterbasketsunderthetrees改为现在完成时、一般过去式、一般将来时的被动语态
曹建福回答：
现完：Litterbasketshavebeenplacedunderthetreesbypeople.
过去：Litterbasketswereplacedunderthetreesbypeople.
将来：Litterbasketswillbeplacedunderthetreesbypeople.
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