Meaning: Solid white precipitation is dropping on the top of the building.
Choice of Words: Snow: precipitation in the form of small white crystals; falls: moves downward through the air; roof: the top of a building.
Alternative Expressions
The roof is covered in snow.
Meaning: This sentence describes the condition of the roof. It is covered in snow.
Choice of Words:Roof is the top part of a building that keeps out the rain and snow. Covered means to have something spread over or on something else. Snow is a type of frozen water that falls from the sky. When you put these words together, you get a picture of a roof that is completely covered in snow.
It is snowing on the roof.
Meaning: This sentence describes what is happening to the snow. It is falling on the roof.
Choice of Words:It is a pronoun that refers to something that has already been mentioned or is understood from the context. Snowing is a verb that means to fall as snow. Roof is the top part of a building that keeps out the rain and snow. When you put these words together, you get a sentence that describes snow falling on the roof.