The passage discusses main ideas and supporting details. The main idea of a passage tells the overall topic in one sentence. Supporting details provide extra information to further explain the main idea and help the reader understand it better. An example paragraph is given about a girl, Sally, spending the weekend shopping for clothes and school supplies. The main idea is that Sally spent the weekend shopping, and supporting details include that she bought new outfits and school supplies. Supporting details give a more complete picture of the story.