Unit7 You mustn't drop litter in the park（课件）-2023-2024学年剑桥少儿英语二级上册

Unit 7 You mustn’t drop litter in the park! 你一定不能在公园扔垃圾 dolphin [ˈdɔlfin] 海豚 river [ˈrivə] 河 must [mʌst] 必须 grass [ɡrɑ:s] 草，青草 shout [ʃaʊt] ] 呼喊，喊叫 kick [kik] 踢 climb [klaim] 爬 shower [ˈʃauə] 淋浴 litter [ˈlitə] 垃圾,废物 really [ ˈriəli] 真正地 sky [skai] 天，天空 edible [ˈedəbl] 可以食用的 I must read books. 表示“一定，必须做……”时，用must。must是情态动词，后面接动词原形。 You must water flowers. He must do homework. 我必须读书。 你必须浇花。 他必须做家庭作业。 I mustn’t play computer. 表示否定为mustn’t，指“一定不能……”。 You mustn’t drive here. He mustn’t swim here. 我一定不能玩电脑。 你绝对不能在这儿开车。 他绝对不能在这儿游泳。 什么是情态动词？ ·有一定的词义，但不能单独作谓语，必须和行为动词 或系动词连用，构成谓语。 ·无人称和数的变化（除have to区别） ·具有助动词的作用，可用来构成否定句，疑问句及 用于简明答语。 ·后加动词原形 一、表示推测类 She must dislike such a man. How can that be true? The woman in the picture may be her sister. must表示肯定是，用于肯定句 can 表示可能，用于否定句，疑问句 may表示可能，用于肯定句 对一般现在推测 对现在进行推测 对一般过去推测 对过去进行推测 “肯定是” “不可能是” “可能是” must be can’t be may be must be doing can’t be doing may be doing must have done can’t have done may have done must have been doing can’t have been doing may have been doing 两个特殊记忆点： You mustn’t smoke in the hospital. Must I finish the homework now? --Yes, you must. /Yes, you have to. --No, you needn’t. /No, you don’t have to. mustn’t表示禁止。 回答Must疑问句，肯定用must；否定用needn’t 或don’t have to. May I come in now? --Yes, you may. /Yes, you can. --No, you mustn’t. /No, you can’t. may表示请求时，肯定回答用may，can；否定回答用mustn’t 或can’t。 二、表示义务类 Students must finish their homework before class. I have to go now. Children should learn to respect others. I need type this letter before work. I need to type this letter before work. must:必须 have to: 不得不 should：应该 need：需要 need 需要（情态动词、实意动词） have to 不得不 三、表示能力类 I can draw. = I am able to draw. I could ride a bike when I was six years old. can:能，可以，相当于be able to 四、表示建议类 You should see a dentist. You had better not go there by air. =You’d better not… should:应该 had better:最好 There is +可数名词单数或不可数名词 “There be”句型，表示“有……”。 There is a hippo in