Passive voice By Phrases

• By Phrases

• 
• We often use passive voice when the performer of an action is not known or is not important.

  -The package was delivered. 

  (We don't know who delivered the package.)
  

  
  

  Add a by phrase at the end of a passive voice sentence when it is important to know who performed an action.

  
  

  passive voice + by phrase
  

  -The package was delivered by FedEx.

  (We know who delivered the package.)
•  Click on the play button to hear the audio

• Mail is delivered by the postal service.	iPhones are made by Apple.
  The Mona Lisa was painted by Leonardo da Vinci.	The packages were received by the receptionist.

 Source : Alison