Where did they grow the flowers?怎么改为被动语态啊

Where did they grow the flowers?怎么改为被动语态啊 When did they invent the plane?改为被动语态. How often did they watch the football 改为被动语态 They grow rice in the southern part of China.改为被动语态 把下列主动语态改为被动语态：when did they build the house?hav Did Tim water the flowers last night被动语态怎么变 将下列句子改为被动语态 where did you build the bridge?can she finish he They cieaned the floor.改为被动语态 They smashed the window.改为被动语态 He bought the flowers for me .（改为被动语态） Does she water the flowers every day?改为被动语态 We planted many flowers in the neighborhood改为被动语态