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