The document discusses elliptical sentences in English grammar. It provides examples of positive and negative constructions using ellipsis with too/so and either/neither. Specifically:
1. Positive constructions can use "...too" or "...so..." followed by a verb like "is" or auxiliary.
2. Negative constructions can use "...either" or "...neither..." followed by a negative verb like "is not".
3. An assignment provides incomplete sentences for the reader to practice completing with appropriate elliptical structures.