Grammar: B1 - 🔑 Modals & Related Structures: Certainty, Possibility, Advice, Obligation - Lesson 1: Modals of Obligation & Necessity (must, have to, don't have to, mustn't

Grammar: Modals of Obligation & Necessity B1 Lesson 1: The Basics What you will learn: By the end of this lesson, you will be able to use must , have to , mustn't , and don't have to to talk correctly about rules and requirements. Strong Obligation vs. No Obligation Modal verbs are special verbs that express ideas like certainty, possibility, or, for today's lesson, obligation and necessity . We will learn the important difference between things that are required and things that are not. "must" / "have to" These both express a strong obligation. Must is often for personal feelings or formal rules. Have to is often for external rules and laws. Example: "I must remember to call my mom." (Personal) "You have to wear a helmet on a moto." (Law) "mustn't" / "don't have to" These have very different meanings! Mustn't is a prohibition (Don't do it!). Don't have to means something is not necessary (you have …