Turn from active into passive

You must water the flowers.
Mum is preparing dinner.
The postman delivered the letter yesterday.
They may cancel the football match.
Will they paint the living room tomorrow.
Baz Luhrmann directed Australia.
They will translate his book into Chinese.

The flowers must be watered by you.Dinner is being prepared by mum.The letter was delivered by the postman yesterday.The football match may be cancelled by them.Will the living room be painted by them tomorrow?Australia was directed by Baz Luhrmann.His book will be translated into Chinese by them.