Question

I have told a lie change in passive voice

Answer 1

A lie has been told by me
this is the passive of I have told a lie

Answer 2

ACTIVE VOICE

Active voice is a type of voice which subject is active or we can say that subject is doing the work the structure of sentnce is as follows:- Subject does work which affects the object.

PASSIVE VOICE

Passive voice is a type of voice which subject is inactive or we can say that subject is being affected by a work the structure of sentnce is as follows:- Subject is affected by a work done by object.

According to your given question the structure of Active voice is as follows:- "Sub + has/have + V3 + object" so the structure of passive voice must be:- "Sub + has/have + been + V3 + object"

So, your answer is as follows :-

⇒Active voice:- I told a lie

⇒Passive voice:-  A lie has been told by me.