Final answer:
A bridge connects parts of a speech, an internal summary recaps key points, and a signpost indicates transitions and highlights in a presentation.
Step-by-step explanation:
A bridge in speech refers to a transition that connects different parts of a presentation or an argument, making it easier for the audience to follow the flow of ideas. An internal summary is a recap within the speech that distills the information just presented, reinforcing it for the audience. A signpost is a statement that functions much like a road sign in a presentation; it helps guide the audience through the structure of the speech, indicating transitions, highlighting key ideas, or warning about shifts in topic or tone. The use of such language aids in maintaining clarity and engagement during a presentation.