Turn these sentences into passive voice.
1. My father waters these flower trees every morning.
2. John invited Fiona to his birthday party last night.
3. Her mother is preparing the dinner in the kitchen.
4. We should clean our teeth twice a day.
5. Our teachers give us a free period this Saturday to prepare the festival.
1. My father waters these flower trees every morning.
-> These flowers trees are watered every morning by my father.
2. John invited Fiona to his birthday party last night.
-> Fiona was invited to John's birthday party last night by him.
3. Her mother is preparing the dinner in the kitchen.
-> The dinner is being prepared in the kitchen by her mother.
4. We should clean our teeth twice a day.
-> Our teeth should be cleaned twice a day.
5. Our teachers give us a free period this Saturday to prepare the festival.
-> We are given a free period this Saturday to prepare the festival by our teachers.