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.

They serve dinner at 6.00  - Dinner is served at 6.00.

They are serving dinner now - Dinner is being served

now.

They served dinner - Dinner was served.

They were serving dinner - Dinner was being served.

They will serve dinner - Dinner will be served.

They have served dinner - Dinner has been served.

They had served dinner - Dinner had been served.

They will have served dinner - Dinner will have been

served.

They should serve dinner - Dinner should be served.

You must serve dinner - Dinner must be served.

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: