Why do we use "been" in present perfect passive tense but not in active.
1) I have bought a house.
2) A house has been bought by me.
First of all, look at a sentence in the present tense:
I love her
To put that into passive mood, we
She is loved
A verb in present perfect simple is have + past participle, for example have bought. To convert a present perfect simple sentence to passive voice, we
I have bought a house
A house has been bought by me.