People are sitting by a lake in which a big fish swimsPeople are sitting by a lake in which a big fish swims
Tropical fish swim underwater among corals and reefsTropical fish swim underwater among corals and reefs
There is a fish swimming in a glass in the cupboard among the booksThere is a fish swimming in a glass in the cupboard among the books
Families of whales swim in the depths of the oceanFamilies of whales swim in the depths of the ocean