Rain softly patters roof.

Meaning: This means that rain is falling on the roof in a gentle and soothing manner.

Choice of Words: Rain is the liquid that falls from the sky. Softly means in a gentle manner. Patter is a verb that describes the sound of light rain or the movement of raindrops. Roof is the top or cover of a building. The sentence says that rain is falling gently on the roof, making a soft pattering sound.