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1、Uni6 GrammarStep I. Leading-in.1.Show a picture of the superman and ask the Ss to do a competetion: Make sentences: What can a superman do? What cannot a superman do?Step II. Language points.1.Show the meanings and usages of can and cannot:can ability 能，能力 could permission 允许 = may2.Show different p
2、atterns of sentences with can and cannot.e.g. My friend can speak English.否定My friend can not/cannot speak English.一般疑问句Can your friend speak English? (一般疑问句，提前情态动词)特殊疑问句What can your friend speak?3. Show the meanings and usages of may and may not:may permission 许可 -可以 (正式) possibility 可能性 -可能 4. Sh
3、ow the meanings and usages of must and must not:must 必须 must be 推测 (只用于肯定句)Step III. More knowledge about modal verbs.1.PossibilityHe is in the classroom. 100%must 99% (must表推测，用于肯定句)e.g. He must be in the classroom.may 50% (may表推测，用于肯定句)e.g. He may be in the classroom.cant / couldnt (can/could表推测用于否定句)e.g. He cant be in the classroom.