Question

have you sold it (voice change)​

Answer 1

Answer:

was it sold by you.........

Answer 2

Answer:

$Was \: it \: sold \: by \: you?$

To convert the Negative Sentences of Present Perfect tense to Passive voice, we just put Not between Has been and have been (has/have + Not + been). For Example: Active Voice: He has not cooked the food so far. Passive Voice: The food has not been cooked by him so far.