Question

Change into passive voice I had never seen a zebra before.

Answer 1

A zebra had never been seen by me before.

Answer 2

Hola!

Here is your answer

$<b><u>A zebra had never been seen before by me.</b></u>$

Here,

In Passive voice, First object is kept, then verb followed by subject.

While in the case of active voice,

first subject, then verb and object.