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

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

By the way, there is no 'e' in arguing.
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.
Try out our live chat room.
Nona The BritYes that is fine.

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