1. They will hold the meeting before May Day.

------->The meeting ......will be held before May Day......

2. Somebody has taken some of my books away

--------> Some of my books have been taken by somebody............

3. They have to repair the engine of the car.

-------> The engine of the car ....HAS TO BE REPAIRED.......

4. They may use this room for the classroom.

---------->This room .......MAY BE USED FOR THE CLASSROOM........

5. The teacher is going to tell a story.

------------A story IS GOING TO BE TOLD BY THE TEACHER...........

6. John used to visit his parents at weekends.

----------> His parents ....USED TO BE VISITED BY JOHN AT WEEKENDS.........

7. They use milk for making butter and cheese.

-------->Milk clothing. ..IS USED FOR MAKING BUTTER AND CHEESE..........

8. They have provided the victims with food and clothing

-----> The victims ......HAVE BEEN PROVIDED WITH FOOD AND CLOTHING......

9 . People speak English in most every corner of the world .

------>. English ...IS SPOKEN IN MOST EVERY CORNER OF THE WORLD.........

10. The students are writing the lesons now .

------> The lesson IS BEING WRITTEN BY THE STUDENTS NOW.

11. Her teacher taught her how to apply this theory

------>She .WAS TAUGHT HOW TO APPLY THIS THEORY BY HER TEACHER.............

12. Someone will tell him that news.

------> he ......WILL BE TOLD THAT NEWS BY SOMEONE....