The cat wakes up when the sun shines.

Meaning: This sentence describes the cat's behavior of waking up when the sun rises.

Choice of Words: Wakes is a verb that means to stop sleeping and become conscious. Up means to a higher position or level. Sun is the star at the center of our solar system. Shines means to emit light. Putting them together, this sentence means the cat stops sleeping and becomes conscious when the light from the sun appears.

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