Final answer:
When using sub-points, a speaker must recognize that sub-points serve as supporting details or evidence for the main points.
Step-by-step explanation:
When using sub-points, a speaker must recognize that sub-points serve as supporting details or evidence for the main points. Sub-points should be related to the main topic and help to further explain or provide examples for the main points being made. For example, if the main point is 'The benefits of exercise,' sub-points could include 'improves cardiovascular health' and 'boosts mood and mental well-being.' Each sub-point should contribute to the overall understanding of the main topic and reinforce the speaker's argument or message.