This document discusses the meanings and proper uses of the modal verbs "could", "would", and "should". It explains that "could" expresses ability or possibility, "would" expresses hypothetical or conditional situations, and "should" is used for advice or suggestions. Examples are provided to illustrate the different meanings. The document concludes by reminding readers to never use "to" after these modal verbs and provides additional examples for practice identifying the correct modal verb based on meaning.