A gerund is a noun that is made when you add -ing to a verb.
So "She was dancing with her best friend" does not have a gerund, since "dancing" is part of the verb phrase "was dancing." Same goes for "After school gets out, I will be swimming," since "will be swimming" is a verb phrase.
There is power in collective action as the one mouse could do nothing to the cat. But the one cat could do nothing to the dog, but 34 mice could because there is power in collective action.
