I. Objectives: - By the end of the lesson, the Ss will be able to read a text about Road Signs to understand Must and Mustn’t for obligation / prohibition. II. Language contents: - Grammar: Modal verb: Must and Must not / Mustn’t. - Vocabulary: dangerous, accident, intersection, slow down, go fast, warn, help. III. Techniques: make the sentences, true- false prediction, picture drill, ask and answer, pair works, group works. IV. Teaching aids: lesson plan, textbook, pictures page 90, 91 and cassette. V. Time: Allotted 45 minutes. ...