Negative expressions are phrases or words that convey a lack of something, denial, or opposition. They often use words like "not," "never," or "no" to indicate the absence of a quality or action. For example, saying "I do not like broccoli" clearly expresses a dislike for broccoli. In language, negative expressions can change the meaning of a sentence significantly. They help to clarify what is not true or what is being rejected. For instance, the statement "She is not coming to the party" indicates that she will not attend, contrasting with a positive expression that would suggest her presence.