Meaning: Water from the clouds came down and landed on the grass that was not wet.
Choice of Words: Rain is water that falls from the clouds. Dry means without water. Grass is a type of plant that grows on the ground.
Meaning: This sentence describes water falling from the sky onto grass that needs water.
Choice of Words: Watered means to give water to something. Thirsty means needing water.
Meaning: This sentence describes water falling from the sky onto grass that is now healthy and green.
Choice of Words: Green is the color of grass when it is healthy and has plenty of water.