There was a horse near the door
There was a lamp by the window
There was a coat on the floor
There were two hands on the table
There was a black hat in the hall
There were three smal keys in a silver cup
There was a silver time on the room
There was a picture in me memory
There was a smiling, happy child]
But there were not empty chairs in every room
And there were strange red lamps in the space.
Ничего сложного, когда видишь что множественное число ставишь глагол to be в форму were, когда единственное was
Good luck!)