Passive voice of: "They turned the wire into the hook".

The wire is turned into the hook by them.

The wire was turned into the hook by them.

The wire has been turned into the hook by them.

The wire will be turned into the hook by them.

The active sentence "They turned the wire into the hook" is correctly converted to passive voice as "The wire was turned into the hook by them".

It indicating that the action was performed by them on the wire.