Решение:
- There is a book on the table.
- There are three chairs in the room.
- There was a cat in the garden yesterday.
- There were many people at the party.
- There is a problem with my computer.
- There are two windows in the kitchen.
- There is a beautiful rainbow in the sky.
- There is no milk in the fridge.
Ответ: is; are; was; were; is; are; is; is.