There( wasn't )a playground in our school before.But there is one now.
there( is )a duck in the pond now.
there( weren't )any ducks in the pond before.
there( are )some flowers on the table now.
there( was )a slide here before.
there( were )some trees here before.
are there( any )trees in the garden?
there are ( some )new students in our classroom.