They swam in the pool for hours.
Meaning: This sentence describes people moving through water using their arms and legs in a body of water for swimming for an extended period of time.
Choice of Words: Swam is a verb that means to move through water using one's arms and legs, in is a preposition that indicates a location or position, pool is a noun that refers to a body of water for swimming, and for and hours indicate the duration of time they spent swimming.
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Related Expressions