Question

change the voice - All telegraph wires have been cut.

Answer 1

Hey friend.....

Answer:- The telegraph wires have been cut (THIS IS ALREADY IN PASSIVE FORM) 

Someone has cut the telegraph wires (THIS IS IN ACTIVE VOICE) 

Answer 2

Answer:

‘They have cut all telegraph wires’ is a passive voice of the given sentence.

Explanation:

The given sentence, ‘All telegraph wires have been cut’, is in the passive voice. Here the subject of the sentence does not perform the work directly. It is done through an agent and the agent is omitted in the sentence. We can assume any agent. To make the sentence active we therefore consider the agent to be ‘they’. ‘They’ now becomes the subject.  

The active verb becomes ‘have cut’ and the subject in the passive sentence-all telegraph wires now shifts to the position of the object. The sentence thus changes to, ‘They have cut all telegraph wires’.