Active voice

Passive Voice

This bird has made a nest

A nest has been made by this bird

I have changed my mind

My mind has been changed by me

They have received a gift

A gift has been received by them

You have removed the table

The table has been removed by you

I have written a letter

A letter has been written by me

We have not seen an Eskimo

An Eskimo has not been seen by us

She has washed two shirts

Two shirts have been washed by her

Have you taught them?

Have they been taught by you?

Has he knocked at your door?

Has your door been knocked at by him?