It is not easy (impossible?) to convert this sentence to passive voice.
The passive refers to something that happens to people/things.
# The fox ate the chicken, is the active voice. The subject (fox) did the action to the object (the chicken).
# The chicken was eaten by the fox. is the passive voice. The subject of the sentence, the chicken, was passive in the action. (well, it probably wasn't! However..) The subject (chicken) was being acted upon by the object of the sentence, the fox.
In the sentence in the question, the birds did nothing to the sky, and the sky had nothing done to it! The nearest approximation might be "The sky is being flown in by the birds!", but that hardly makes any sense!
huh?
The kites were being flown by the boys.
This phrase already is in passive voice
The sentence "I am going to school" in passive voice can be converted to "School is going to be attended by me."
Britain was invaded by the Romans.
The passive voice of ''what do you do'' is "what is done by you?"
"Your name is not known by me." is passive voice.
Here is the sample you are seeking:Is your house being renovated by you?
The passive version is, noise has been made.
Passive voice
"Will you marry me" can be changed to passive voice as "Will I be married by you." In the passive voice sentence, the subject of the active voice becomes the object of the passive voice, and the object of the active voice becomes the subject of the passive voice.
To convert the present perfect continuous tense into passive voice, use "has been" or "have been" followed by the past participle of the main verb. For example, "They have been cooking" in present perfect continuous becomes "Cooking has been being done by them" in passive voice.