Passive voice: My father waters this flower every morning

1.My father waters this flower every morning.
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2.John invited Fiona to his birthday party last night.
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3.Her mother is preparing the dinner in the kitchen.
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4.We should clean our teeth twice a day.
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5.Our teachers have explained the English grammar.
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6.Some drunk drivers caused the accident in this city.
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7.Tom will visit his parents next month.
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8.The manager didn’t phone the secretary this morning.
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9.Did Mary this beautiful dress?
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10.I won’t hang these old pictures in the living room.
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11.The German didn’t build this factory during the Second World War.
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12.The Greens are going to paint this house and these cars for Christmas Day.
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13.Ann had fed the cats before she went to the cinema.
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14.The students have discussed the pollution problems since last week.
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15.Have the thieves stolen the most valuable painting in the national museum?
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16.Some people will interview the new president on TV.
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17.How many languages do they speak in Canada?
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18.Are you going to repair those shoes?
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19.He has broken his nose in a football match.
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20.Have you finished the above sentences?
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