Question

the plan of going over was not forgotten (change the active voice)
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Answer 1

Explanation:

Passive voice is of the form 'The object has been done by the subject'. ... The given sentence is in the passive voice. The passive voice can be changed into an active voice by using to be and past participle form of the verb. 'forget' is the past participle of forgotten

Answer 2

Answer:

I have never forgotten the plan of going over.

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