CORRECTION/S:

My dream room is a tree room.

It is on the top of a big tree, so I can see the whole of the world.

If it is winter, it will be very warm for a leaf.

If it is summer, it will be very cool.

In the tree house, there's a very big warm bed. It also has a fantastic view.

Things to improve on:
>articles
>preposition
>punctuation marks
>conditionals
>choices of words

Thank you for doing your homework, Ann!