The document discusses how language can have one form with multiple meanings, and one meaning with multiple forms. It provides examples of how the present continuous tense can express both present and future meanings depending on time markers. Additionally, it explains how the future tense can be expressed using different structures like "I'll do" and "I'm going to do" but both mean the same thing. Finally, it notes that words can have different connotations and meanings depending on context, giving the example of "smart" and "intelligence".