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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.She used to pull my hat over my eyes.
=> My hat was used to pull over my eyes by her.

 13.For the past years, i have done all my washing by hand
=> For the past years, all my washing has been done by hand. 

14.A pair Robins has built a nest in the porch since last week.
=> A nest has been built in the porch by a pair Robins since last week.

15.

the police haven't found the murderer yet.

=> the murderer haven't been found by the police yet

16. They sold one of her own paintings at $1,000.  

=>One of her paintings was sold at $1000.

17.I will put your gloves back in your drawer.

=>Your gloves will be put in the drawer by me

18.People speak English in almost every corner of the world

=>Ko biết trả lời

19.Luckily for me, they didn't call my name.

=>Ko biết trả lời

20.You mustn't use this machine after 5:30 p.m.

=>Ko biết trả lời