Revise the passage by changing all of the gerunds to infinitives and all of the infinitives to gerunds. “giving is one of the best things people can do. to volunteer their time shows what caring people they are.”

"To give is one of the best things people can do. Volunteering their time shows what caring people they are".

Explanation: A gerund is a non-finite verb form that ends in -ing and functions as a noun. An infinitive is also a non-finite verb form, but it is formed with "to" and the simple form of a verb. Moreover, an infinitive can work as a noun, an adjective or an adverb. In the passage provided, "giving" is a gerund because it ends in "-ing" and it is working as a noun; therefore, it must be transformed into an infinitive by adding "to" and writing the simple form of the verb: "give". Furthermore, "to volunteer" is an infinitive because it is made up of "to" and the simple form "volunteer". "To volunteer" must be changed into a gerund by deleting the "to" and converting "volunteer" into a gerund: "volunteering".  

invention of the washing machine

in the past, people used sticks and stones or scrub boards to clean their clothing. as it was sweaty, backbreaking work, we owe a world of to james king because he created the model for the modern washing machine in 1851. the most important issue was that this machine cleaned clothes while a person cranked the handle. doing this made people who used it develop strong muscles in their arms. later, in 1908, alva j. fisher created an electric washing machine named thor. this one was not the first automatic washing machine. however, it was one of the most popular models at the time.