1. They can’t make tea with cold water. 
- Tea can't be made with cold water. 
2. The chief engineer was instructing all the workers of the plant. 
- All the workers of the plant were being instructed by the chief 
3. Somebody has taken some of my books away. 
- Some of my books have been taken away 
4. They will hold the meeting before May Day. 
The meeting will be held before May Day 
5. They have to repair the engine of the car. 
The engine of the car has to be repaired 
6. The boys broke the window and took away some pictures. 
The window was broken and some pictures were taken away by the boys 
7. People spend a lot of money on advertising everyday. 
A lot of money is spent on advertising everyday 
8. They may use this room for the classroom. 
This room may be used for the classroom 
9. The teacher is going to tell a story. 
A story is going to be told by the teacher 
10. Mary is cutting the cake with a sharp knife. 
The cake is being cut with a sharp knife by Mary 
11. The children looked at the women with a red hat. 
The women with a red hat was looked at by the children 
12. They have provided the victims with food and clothing. 
The victims have been provided with food and clothing 
13. The teacher explains the lesson. 
The lesson is explained by the teacher 
14. Mrs Green is cooking the food in the kitchen. 
The food is being cooked by Mrs Green in the kitchen 
15. The doctor examined the patients. 
The patients were examined by the doctor 
16. These boys made that noise 
That noise is made by these boys 
17. People speak English all over the world. 
English is spoken all over the world 
18. He gave him back the money last Sunday.