They have found ways to make waste water clean.的被动语态则怎么变?

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Theyhavefoundwaystomakewastewaterclean.的被动语态则怎么变?Theyhavefoundwaystomakewastewaterclean.的被动语态则怎么变?Th

They have found ways to make waste water clean.的被动语态则怎么变?
They have found ways to make waste water clean.的被动语态则怎么变?

They have found ways to make waste water clean.的被动语态则怎么变?
The ways to make waste water clean have been found by them.

Several ways of making waste water clean have been found.