1.When did you invent the strange machine 2.Where do people plant the trees (都改为被动语态)
问题描述：
1.When did you invent the strange machine 2.Where do people plant the trees (都改为被动语态)
答
When was the strange machine invented by you?
Where are the trees planted by people?
答
When was the strang machine invented by you?
Where are the trees planted by people?
老师祝你学习进步！
望采纳，多谢！^_^
答
When was the strange machine invented by you?
Where are the trees planted?(我认为本句应该用一般过去时态,也就是are改成were)