The document discusses adjectives ending in -ED or -ING in English. It explains that adjectives ending in -ING describe a characteristic, while those ending in -ED describe a feeling. Examples are given to illustrate the difference, such as "My girlfriend is bored" means she feels bored, while "My girlfriend is boring" means she has a boring personality. An exercise provides sentences to fill in with the correct adjective form, and a test section asks the reader to identify the proper adjective use in sentences.