structural:summarization
What prescriptivists claim

To illustrate the prescriptivist view, consider the moral sentence, “Suicide is wrong.” According to moral realism, such a sentence claims there to be some objective property of “wrongness” associated with the act of suicide. According to some versions of emotivism, such a sentence merely expresses an attitude of the speaker; it only means something like “Boo on suicide!”, but according to prescriptivism, the statement “Suicide is wrong” means something more like “Do not commit suicide.”. What it expresses is thus not primarily a description or an emotion, but an imperative. General value terms like “good”, “bad”, “right”, “wrong” and “ought” usually also have descriptive and emotive meanings, but these are not their primary meanings according to prescriptivists.