问题描述：
这句话 改为被动 为什么后面的动作 要用完成时 一般都什么时候用完成时?
原句：it is thought that the prisoner escaped by climbing over the wall.
改为：the prisoner is thought to have escaped by climbing over the wall
如果有时间的话 请解答一下这道题 谢谢!
原句：it is thought that the prisoner escaped by climbing over the wall.
改为：the prisoner is thought to have escaped by climbing over the wall
如果有时间的话 请解答一下这道题 谢谢!
问题解答：
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