Answer:
He uses many plural terms associated with the pronoun "you".
Explanation:
When Franklin uses the pronoun "you" when addressing George Washinton, but uses plural words associated with that pronoun, it means that he is referring to more people than Washington.
This is because the pronoun must accompany the number that the nouns, to which they are related, are representing. Thus, if the pronoun "you" is related to a plural noun, it means the pronoun "you" is related to more than one person.
For example: