The document discusses the use of auxiliary verbs in short-form responses to agree, disagree, or add information to a statement. It provides rules for responses that agree, disagree, or add confirming or contrary information using verbs like "yes", "no", "so", and "but". It also notes that the "agent" refers to the performer of the action, which may differ from the grammatical subject.

1. Short-form responses using auxiliary verbs Marc Hoefkens Based on “Living English Structure” (W. Stannard Allen)