Chirping birds flew across the sky.
Meaning: This sentence describes birds making sounds while moving through the air from one side of the sky to the other.
Choice of Words: Chirping is a sound made by birds, and flew means to move through the air using wings. Across indicates movement from one side to the other. The is used to refer to a specific thing or group of things. Sky is the area above the earth that we can see.
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