There was/were some mountains in Japan.
were
What was in the forest?
There were some trees in the forest.
There was ..............................
a lake
What was on the island?
There were some beaches on the island.
There was/were a beach on the island.
was
There was/were some trees in the park.
were
There was ................................
an island
There was/were a hill
was
What was in the garden?
There was some grass in the garden
What was on the island?
There was a forest on the island.