Question

Somebody has stolen all the red roses.(active to passive voice)​

Answer 1

Answer:

All the red roses have been stolen by someone

Answer 2

All the red roses have been stolen by somebody.

or

All the red roses have been stolen.

We don't need to add "by somebody" in passive form.

Some notable points for passive voice is,

• The stress is on the object of the sentence and not the subject.

• The verb is always in third form.

• Very often 'by' is used before the subject.