The document discusses sentence stress in English. It explains that sentence stress emphasizes certain words in a sentence to convey meaning. Content words carry the most important information in a sentence, while function words make sentences grammatically correct. Examples of content and function words are provided. The document then provides examples of dialogues where either the content or function words are removed. Readers must use sentence stress to determine the missing words and understand the intended meaning. The document encourages practicing identifying sentence stress through reading the example dialogues.