A tall tree.

This tree is tall and green.

A river.

This river is long.

A pond.

Fish and frogs live in this pond.

An ocean.

We can't drink ocean water.

A mountain.

Some mountains are very high.

A forest.

A forest has many trees.

A little dog.

This little dog is working.

A sleeping cat.

This cat is sleeping.

To bird in the tree.

This two birds are in a tree.

A frog.

This frog lives in the pond.

A family of ducks.

This is a family of duck.

A little dog.

This little dog is walking.

A black and a white cat.

That cat is sleeping.

A bird.

Birds can fly.

A frog.

This frog lives  in a pond.

Ducks.

This is a family of ducks.