Question

she writes a letter in passive voice

Answer 1

Active Voice :
She writes a letter.

Passive Voice :
A letter is written by her.

Answer 2

Answer:

A letter is written by her

Explanation:

Passive Voice is a form or set of forms of a verb in which the subject undergoes the action of the verb.

Thus, in the sentence the object which is a letter will come first, followed by a helping verb is/am/are with third form of the verb and subject.

As the sentence is present, we should use present tense.

Object + is/am/are + V3 + by + subject.