Meaning: This sentence describes rain gently and quietly falling onto the roof of a building, creating a soothing and rhythmic sound.
Choice of Words: The word "rain" refers to water droplets falling from the sky, "falls" describes the downward movement of the rain, "softly" means in a gentle and quiet manner, "on" indicates the surface or object that the rain is falling onto, and "roof" refers to the top covering of a building.