Question

They have broken the window panes (change it into passive voice)​

Answer 1

Answer:

The window panes were broken by them.

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Answer 2

The window panes have been broken by them. -This is the answer.

About passive voice:

• The given sentence is in active voice. We have to change it into passive voice.
• When a sentence is changed into passive voice, the subject becomes passive/ inactive. So the subject 'they' becomes 'by them' and comes at last.
• The object and the action done take importance. Thus the sentence begins with the object 'the window panes'.
• The tense must be retained. The verb takes its past participle form.
• The 'be' verb will precede the past participle according to its tense. The tense used is present perfect. So the verb 'have broken' changes into 'have been broken'.
• Therefore the answer is: The window panes have been broken by them.