They are waiting for Macbeth<span> to arrive. When he enters the scene, he demands to hear the witches' predictions. They summon their "masters", three ghostly beings who provide </span>Macbeth<span> with vague warnings against </span>Mac Duff<span>, warnings that </span>Macbeth<span> does not listen to in the end.</span>
Since this is an effective thesis statement for a five-paragraph essay, it must include a topic, a claim, and three main ideas.