Chuyển những câu sau sang câu bị động:
11. My father waters this flower every morning
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12. John invited Fiona to his birthday party last night.
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13. Her mother is preparing the dinner in the kitchen.
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14. We should clean our teeth twice a day.
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15. Our teachers have explained the English gramar.
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16. Some drunk drivers caused the accident in this city.
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17. Tom will visit his parents next month.
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18. The manager didn't phone the secretary this morning.
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19. Did Mary wear this beautiful dress last night?
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20. I won't hang these old pictures in the loving room.
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. Some drunk drives caused the accident in this city.
The accident was caused in this city by some drunk drivers
. Tom will visit his parents next month.
Tom’s parents will be visited next month
. The manager didn't phone the secretary this morning.
The secretary wasn’t phoned by the manager this morning
Did Mary buy this beutiful dress?
Was this beautiful dress bought by Mary?
I won't hang these old pictures in the living room.
These old pictures won’t be hung in the living room
The German didn't build this factory during the Second World War.
This factory wasn’t built by the German during the Second World War
The Greens are going to paint this house and these cars for Christmas Day.
This house and these cars are going to be painted for Christmas day by the Greens
. Ann had fed the cats before she went to the cinema.
The cats had been fed by Ann before she went to the cinema
The students have discussed the pollution problems since last week.
The pollution problems have been discussed by the students since last week
. Have the thieves stolen the most valuable painting in the national museum?
Has the most valuable painting in the national museum been stolen by the thieves?