1 they can't make tea with cold water 
=> the cold water can't be made with tea by them
2 they will hold the meeting before May Day
=> the meeting will be hold before may day
3 His father will help you tomorrow 
=> you will be helped by his father tomorrow

1. They can’t make tea with cold water. 
- Tea can't be made with cold water. 
2. They will hold the meeting before May Day. 
The meeting will be held before May Day 
3. .His father will help you tomorrow.

,.................you will be helped by his father tomorrow..........................

1. They can’t make tea with cold water.
Tea can't be made with cold water.