In this B2 lesson, students will learn how to correctly use six essential grammar forms to talk about real-life responsibilities and routines.By the end of the class, students will understand:The difference between external obligation (have to) and personal obligation (must).How to express permission using be allowed to.How to describe past habits that are no longer true using used to.How to talk about ongoing actions that started in the past using have been + -ing.How to give advice or recommendations using should.Students will also clearly know:After must / should / have to, use the base form of the verb (no “to” after must/should).✔ I must finish.✘ I must to finish.After used to, use the base verb.✔ I used to work weekends.Have been + verb-ing shows duration or recent continuous activity.✔ I have been working late.The goal is not to memorize complex rules, but to understand:Where the obligation comes from.Whether something is past, present, or ongoing.Whether the sentence expresses a rule, advice, or personal decision.After the presentation, students should feel confident using these forms naturally in discussion.