Clouds move very fast.
Meaning: This means that the clouds are moving very quickly.
Choice of Words: Clouds are a noun that refers to the visible collection of water droplets or ice crystals suspended in the atmosphere of a planet. Move is a verb that means to change position or location. Very is an adverb that means to a great degree or extent. Fast is an adjective that means moving at a high speed. When you put them together, "Clouds move very fast" describes the clouds changing position or location at a high speed.
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