1. My father waters this flower every morning.

 ……………This flower is watered by my father every morning………………………………………………………………….

1. John invites Fiona to his birthday.

 ………………………Fiona is invited to John's birthday party (by him)……………………………………………………….

1. Her mother preparesthe dinner in the kitchen.

 ………………Dinner is prepared in the kitchen by her mother……………………………………………………………….

1. We clean our teeth twice a day.

 ……………………Our teeth are cleaned twice a day………………………………………………………….

1. Our teachers  explain the English grammar.

 …………………The E grammar is explained by our teachers…………………………………………………………….

1. Some drunk drivers causes the accident in this city.

 …………………The accident is caused in this city by some drunk drivers…………………………………………………………….