Question

by whom was this letter sent (chnge the voice)

Answer 1

$\bold {{HELLO!Your\: ANSWER}}$

>>Who sent this letter?

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Answer 2

HolA mAte !

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Changing to Active voice :-

▶ Who sent this letter ?

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Some rules to remember :-

▶ Always remember that while chamging from Passive voice to Active voice ,

Bring the subject (the do-er of the object ) to the front of the sentence and the object ( the work of the subject ) should be placed after the subject in the sentence with a finite verb between them .

The tenses should be changed accordingly .

Here , the tenses changed are -

Was sent - sent .

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HOPE HELPS !