Question

Active voice to passive voice rule is tence changing

Answer 1

active voice = I eats a mango
passive voice = A mango is eaten by me

Answer 2

A verb in present indefinite tense forms passive voice by using is am are(forms of be tense)before it's third form.
A verb in it's present continuous tense forms it's passive voice by using is being,am being or are being (forms of be in this tense)
A verb in it's present perfect tense forms it's passive voice by using has been or have been before it's third form.
A verb in it's past indefinite tense forms it's passive voice by using was or were before it's third form.
A verb in the past continuous tense forms it's passive voice by using was being or were being before it's third form.
A verb in it's past perfect tense forms it's passive voice by using had been before it's third form.
A verb in it's future indefinite tense forms it's passive by using will be or shall be before it's third form.
A verb in the future perfect tense forms it's passive voice by using will have been or shall have been before it's third form.