Some students swimming in the sea,some students played beach volleyball.这句话对吗（注意：这是过去式）

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Somestudentsswimminginthesea,somestudentsplayedbeachvolleyball.这句话对吗（注意：这是过去式）Somestudentsswimmingin

Some students swimming in the sea,some students played beach volleyball.这句话对吗（注意：这是过去式）
Some students swimming in the sea,some students played beach volleyball.这句话对吗
（注意：这是过去式）

Some students swimming in the sea,some students played beach volleyball.这句话对吗（注意：这是过去式）
错的吧,游泳怎么能加ing?