两句话改被动语态

来源：百度知道 编辑：UC知道 时间：2024/05/27 21:00:51
1Someone must have turned on the light without your notice
2they have found ways to make waste water clean

The light must have been turned on (by someone) without your notice.

Ways have been found to make waste water clean. 或者

They have found ways for the waste water to be made clean.

the light must have been turned on without your notice
some ways have been found by them to make waste water clean

1.the light has been turned on by someone without your notice.
2.the ways to make waste water clean have been found by them.