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at rules and suggestions we should obey to protect our environment. Write down their answers. Ask pairs to show out their answers. Step Ⅶ Summary Read the new words , phrases and useful expressions and the pattern of rules. Step Ⅷ Homework 1. Read the dialogue 2. Write some rules or suggestions if you are watching a film in the cinema. Teaching resources 教學(xué)資源庫 Ⅰ . 情態(tài)動(dòng)詞 情態(tài)動(dòng)詞有 can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情態(tài)動(dòng)詞無人稱和數(shù)的變化;不能單獨(dú)使用,必須與其后的動(dòng)詞原形構(gòu)成謂語。 1. can, could 1) 表示能力(體力、知識、技能)。 例如: Can you lift this heavy box?(體力) Mary can speak three languages.(知識) Can you skate?(技能) 此時(shí)可用 be able to代替。 Can只有一般現(xiàn)在時(shí)和一般過去式;而 be able to 則有更多的時(shí)態(tài)。例如: I’ll not be able to e this afternoon. (一般將來時(shí)) 當(dāng)表示 “經(jīng)過努力才得以 做成功某事 ”時(shí)應(yīng)用 be able to,不能用 Can。如: He was able to go to the party yesterday evening in spite of the heavy rain. 2) 表示請求和允許。 例如: Can I go now? Yes, you can. / No, you can’t. 此時(shí)可與 may互換。在疑問句中還可 用 could, might代替,但 could, might 并不表示過去式,只是語氣更委婉。它們不能用于肯定句和答語中。 例如: Could I e to see you tomorrow? Yes, you can. (No, I’m afraid not.) 3) 表示客觀可能性(客觀原因形成的能力)。例如: They’ve changed the timetable, so we can go by bus instead. This hall can hold 500 people at least. 4) 表示推測(驚訝、懷疑、不相信的態(tài)度),用于疑問句、否定句和感嘆句中。 Can this be true? This can’t be done by him. How can this be