Rain falls down from sky.
Meaning: This means it is raining.
Choice of Words: Rain is water that falls from the sky. Falls means to drop or move downward. Down means from a higher to a lower position. From is a preposition used to indicate the source or origin of something. Sky is the region of the atmosphere and space seen from the surface of the Earth. When you put them together, "Rain falls down from sky" means that water that falls from the sky drops or moves downward from a higher to a lower position from the region of the atmosphere and space seen from the surface of the Earth.
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