What do topic sentences typically address?

Topic sentences typically address the main idea of a paragraph, providing a clear focus for the information that follows. In that context, discussing "How and Why" is crucial because these elements delve into the reasoning and methods behind the topic. This aligns with the purpose of a topic sentence, which is to set the stage for discussion and elaboration. By addressing "How," the sentence can outline processes or approaches related to the topic, while "Why" explains the significance or rationale behind it. This combination ensures that the reader understands not just the what, but also the deeper implications of the subject being presented.

In contrast, addressing "Who and What" might focus more on identification rather than on the processes or reasons. Covering "When and Where" could lead to a temporal or spatial context, which does not necessarily convey the depth of understanding that "How and Why" provides. Similarly, "What and Why" captures some aspects of the topic but does not include the operational dimension that "How" represents, which is essential for a comprehensive exploration of the topic.