They are swimming now。
还是加上now好一些，没有也行，我更喜欢有now，
为体现她们是女性可以这样表达：
Those women are swimming now.(那些女人）
Those girls are swimming now.（那些女孩）
Those ladies are swimming now.（那些女士）
Those females are swimming now.（那些女性）
英语中第三人称复数统一用they 即，They are swimming. 如要区分性别需要根据上下文
They are swimming.
be doing 表示正在做某事
望采纳，谢谢(*^__^*)
They are swimming.（现在进行时）
They were swimming.（过去进行时）
They are swimming
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