Meaning: This sentence describes the water falling from the sky onto the top of a building.
Choice of Words: Rain is water falling from the sky. Falls is a verb meaning to move downwards. Roof is the top of a building.
Alternative Expressions
Water drips from the sky.
Meaning: This means that the water from the clouds is coming down in small drops. It's like when you see water falling from the sky and landing on the ground.
Choice of Words:Water is the liquid that we drink and that makes up most of the Earth. Drips means to fall in small drops. Sky is the blue area above us where the clouds are. When you put them together, "Water drips from the sky" means that the water from the clouds is falling down in small drops.
The clouds release moisture.
Meaning: This means that the clouds are letting go of the water that they are holding. It's like when you see water coming out of the clouds and falling down to the ground.
Choice of Words:Clouds are the white fluffy things in the sky that hold water. Release means to let go of something. Moisture is the water that is in the air. When you put them together, "The clouds release moisture" means that the clouds are letting go of the water that they are holding.