You would use the word "aquatic" as an adjective in a sentence when you want to describe something as pertaining to water since "aquatic" when used as an adjective means "relating to water."
Christmas in Europe monaco is a popular festival celebrated in the country with the same enthusiasm and fervor as in all other parts of the world. Christmas is one of the most important festival observed in the world.
I don't understand the question!
nous verrons le nouveau film de François