Ball fly fast in sky.
Meaning: A ball is moving quickly through the air in the sky, probably being thrown or kicked.
Choice of Words: Ball is a spherical object, usually used in sports. Fly means to move through the air, often with wings. Fast means at a high speed. In is a preposition that indicates a location or position within something. Sky is the upper atmosphere of the Earth, where clouds, birds, and airplanes are found.
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