This document discusses how to teach modals, which are auxiliary verbs used to talk about obligations, suggestions, advice, and expectations. It explains that there are two types of modals: simple modals for the present and future, and perfect modals to show necessity in the past tense. Examples are provided for how to use each modal, including must, have to, should, could, might, and others. The document concludes by providing sample sentence pairs and conversation cards that could be used to discuss modals in small groups.