问题描述：
change the active voice into the passive voice.主动改被动
Do they take care of the sick?
He was operating on an old patient.
I will be looking into the matter.
You may find this kind of trees everywhere.
Do they take care of the sick?
He was operating on an old patient.
I will be looking into the matter.
You may find this kind of trees everywhere.
问题解答：
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