Question

Birds fly in the air change into passive voice

Answer 1

Answer:

people know that birds fly in the air.

Explanation:

Answer 2

Answer:

We cannot change this sentence to passive voice because there is not object.

Explanation:

when we ask the question what or whom to the subject, we don't get any answer. Therefore the sentence does not have an object and hence the verb is an intransitive verb. And we cant change the voice of sentences with an intransitive verb.