Why the Passive Voice Is So Useful, Neil?

The passive voice is useful when we don't know who or what performed the action, or if anyone knows it. We use it to give importance to the receiver of the action of a verb. Here's a present tense example: Millions of songs are downloaded every day. A past tense example: 15 million songs were downloaded yesterday. Change these sentences from active into passive. And remember, you might not need a doer.