Предложения нужно переделать из активного залога в пассивный
They serve dinner at 6.00
They are serving dinner now.
They served dinner.
They were serving dinner.
They will serve dinner.
They have served dinner.
They had served dinner.
They will have served dinner.
They should serve dinner.
You must serve dinner.
Dinner is served at 6.00 by them.
Dinner is being served now by them.
Dinner was served by them.
Dinner was being served by them.
Dinner will be served by them.
Dinner has been served by them.
Dinner had been served by them.
Dinner will have been served by them.
Dinner should be served by them.
Dinner must be served by you.
Объяснение: