On the one hand, a gerund is a verb that acts as a noun, know for the -ing form. On the other hand, an infinitive is the basic form of a verb, that usually follows "to" or another verb form. The revised sentence, including both of these, is:
"To give is one of the best things people can do. Volunteering their time shows what caring people they are."
By changing the gerunds to infinitives and the infinitives to gerunds, the sentence will be "To give is one of the best things people can do. Volunteering their time shows what caring people they are".
It should be noted that a gerund is a verb that acts as a noun, and can be seen in the formation of the -ing form. An infinitive simply means the basic form of a verb, that usually where "to" is added to another verb form.
Therefore, based on the above explanation, the revised sentence will be "To give is one of the best things people can do. Volunteering their time shows what caring people they are".
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