Can you tell me if it is correct to say:
Speaking, discussing, and argueing are fun.

Playing, swimming, and hiking are healthy.
Yes that is fine.

By the way, there is no 'e' in arguing.
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Yes, those are fine. The limitation would only be on the number of gerunds, and that would be a question of style, not grammar.

Oh-- hello, Nona.
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Nona The BritYes that is fine.

By the way, there is no 'e' in arguing.
I wasn't attentive. Thanks, anyway.