Question

they opened the window passive voice for this

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Answer 1

Answer:

The window was opened by them

Explanation:

hope it helps

Answer 2

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The window was opened by them.

Structure ↴

Subject + was/were + past participle form of the main verb + Object

Extra Information ↴

(1) The object in the active voice becomes the subject in the passive voice.

(2) The subject in the active voice becomes the object in the passive voice. It is generally preceded by the preposition 'by'.

(3) The main verb (the finite verb) of the sentence is changed into its past participle form, and it is preceded by the correct form of 'be' verb in passive voice.

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