The Sentence in the Passive Voice

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 an action by putting it at the start. 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. 6-minute run on bbclearningenglish.com.