This document discusses ways to agree with affirmative and negative statements in English using short expressions. It provides examples of agreeing with positive statements using "too" and "so", and with negative statements using "either" and "neither". Specifically, it notes that "too" and "so" are used for agreeing with two positive statements, while "either" and "neither" are used for agreeing with two negative statements. It also provides guidance on grammar and word order for these short agreements.