Respuesta :
Hey friend:-
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QUESTION:-
I don't know Master (voice should be changed)
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Given question is in active voice ,in which subject(I) affects the object (Master)
In passive voice object is affected by subject .
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SO,
ANSWER IS:-
=>Master is not known .
OR ELSE
=>Master is not known by me .
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✨✨BE BRAINLY✨✨