| A | B |
|---|
| Mary mailed the letter. | The letter was mailed by Mary. |
| The hypothesis has been tested in experiments conducted by scientists. | Scientists have conducted experiments to test the hypothesis. |
| The book is being read by most of the class. | Most of the class is reading the book. |
| The votes have been counted. | The volunteers have counted the votes. |
| The tray of food was dropped by the waiter. | The waiter dropped the tray of food. |
| The police questioned the suspect for hours. | A suspect was questioned for hours by the police. |
| The kid ate all the homemade cookies. | All the homemade cookies were eaten by the kid. |
| Many people play Flappy Bird. | Flappy Bird is played by many people. |
| Bobby changed the flat tire. | The flat tire was changed by Bobby. |
| The entire house was painted by the family. | The family painted the entire house. |
