12. The chief engineer was instructing all the workers of the plan. 13. They can’t make tea with cold water. 14. Somebody has taken some of my books away. 15. They will hold the meeting before May Day. 16. They have to repair the engine of the car. 17. The boys broke the window and took away some pictures. 18. People spend a lot of money on advertising every day. 19. Teacher is going to tell a story. 20. Mary is cutting a cake with a sharp knife. 21. The children looked at the woman with a red hat. 22. They have provided the victims with food and clothing. 23. People speak English in almost every corner of the world. 24. You mustn’t use this machine after 5:30 p.m. 25. After class, one of the students always erases the chalk board

`12.` The chief engineer was instructing all the workers of the plant.

`->` all the workers of the plan were being instructed by The chief engineer

`13.` Somebody has taken some of my book away.

`-> `some of my book have been taken away

`14.` They will hold the meeting bofore May Day.

`->`the meeting will be held bofore May Day.

`15. `They have to repair the engine of the car.

`-> `the engine of the car has to be repaired

`16.` The boys broke window and took away some pictures.

`->`the window was broken and some pictures were taken away by the boys

`17.` People spend a lot of money on advertising everyday.

`->` a lot of money is sent on advertising everyday.

`18.` They may use this room for the classroom.

`->` this room may be used for the classroom.

`19.` The teacher is going to tell a story.

`->`a story is going to be told by the teacher

`20.` Mary is cutting the cake with a sharp knife.

`->` the cake is being cut with a sharp knife by Mary.

`21.`The children looked at the woman with a red hat.

`→`The woman was looked at with a red hat by the children 

`22.`They have provided the victims with food and clothing.

`→ `The victims have been provided with food and clothing 

`23.`People speak English in almost every corner of the world.

`→` E is spoken in almost every corner of the world

`24.` You mustn’t use this machine after 5:30 p.m.

`→` This machine mustn't be used after 5:30 p.m

`25.`After class, one of the students always erases the chalk board

`→`After class, the chalk board is always erased by one of the students