The architectural feature of the Islamic artists that came from the Romans was the horseshoe arch. This is what they liked best in Roman culture, so they decided to use it in their art and architecture as well. Islamic architecture is quite different from any other, although it was certainly influenced by many other world architectures.

TOPIC:- PASSIVE VOICE
QUESTION:- He was painting a portrait.
ANSWER:- A portrait was being painted by him
RULES FOR FORMATION:-
1. Change the object into subject.
2. use 3rd form of verb .
3. use by and then use subect as object.
HOPE IT HELPES YOU.