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 worker of the plant
-> All the workers of the plant was being instructed by the chief engineer.
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.