Final answer:
In English grammar, the second person plural formal uses the third person form of the verb.
Step-by-step explanation:
The subject of this question is English and the grade level is High School.
In English grammar, the second person plural formal uses the third person form of the verb. This means that when addressing a group of people formally, such as in a business or professional setting, we use the third person form of the verb instead of the second person. For example, instead of saying 'You should do this,' we would say 'They should do this.'
This is done to show respect and maintain a formal tone, as well as to avoid direct address to individuals.