There is a ....
cat
... a bird in the park.
There isn't
... a swing in the park.
there is
... flowers in the park.
There are
... a slide in the park.
there is
There are ....
birds
There are ....
trees
They are playing in the ....
park
... any birds in the park.
There aren't
There is a ....
slide
... a bench in the park.
There is
There are ....
flowers
There is a ....
swing
... a fountain in the park.
there is
There are three ...
kites
... three rabbits in the parks.
There are
There is a ....
fountain
There is a ....
bench
... a fountain in the park.
there isn't
... three cats in the park.
there aren't