As you read a text, new details will shape, or form, your understanding of the central idea. this means that your thoughts about the central idea might change as you read. it’s a good idea to stop and clarify your understanding of the central idea while reading a text. look at the next section of the excerpt from the footprints of time. answer these questions as you read: what new details are included about the roman government? how do these details change your thoughts about the central idea? how do specific words help you understand these ideas?