They flew far across the sky.
Meaning: This means people were moving through the air at a great distance from one side to the other of the sky.
Choice of Words: Flew is a simple past tense verb that describes the action of moving through the air. Far is an adjective that means at a great distance. Across is a preposition that describes movement from one side to the other. Sky is a noun that refers to the upper atmosphere as seen from the Earth's surface. Putting them together, this sentence describes people moving through the air at a great distance from one side to the other of the upper atmosphere as seen from the Earth's surface.
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Related Expressions