Generally the present continuous does not accept state verbs without a change of meaning. Some state verbs are: "hate" (hate), "like" (like), "want" (want), "have" (have), and "know" (know). These verbs are used to talk about something that "is" or "is not", or "is" or "is not". For example, "hate" you have or you don't have, but normally one cannot be "hating". Likewise, she cannot be "liking", "wanting", "having" or "knowing". Instead of the present continuous we use the present simple to express these states.