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课件网) Leading in Unit 2 Grammar 北师大版2024英语八年级上册 语法课 Learning Aims 识记情态动词和不定代词的基本含义、用法及易混词差异。（学习理解） 01 在对话、写作中正确使用两类词，灵活匹配语境，通过练习提升熟练度。（应用实践） 02 在复杂场景（阅读、写作）中运用，理解表达意图，对比中英差异。（迁移创新） 03 Presentation Contents Leading in 1 Prsentation 2 Practice 3 Exercise 5 Homework 6 Summary 4 01. Leading in Leading in Autumn Outing Battle! ——— Safety and Preparation Guide Class, our autumn trip to the Forest Park is tomorrow! Everyone must follow 3 safety rules — check the animation tips! Leading in Safety Rules Must stay with the group. Must keep away from fire. Must stay in the designated area. Must I stay with the group even when picking up fallen leaves Yes! Everyone must stay within the teacher’s sight. Safety first! Presentation Must stay with the group. Must stay in the designated area. Must keep away from fire. Everyone must stay within the teacher’s sight. Safety first! 情态动词 不定代词 02. Presentation Presentation Presentation 情态动词must 表示：必须、义务 must 句式结构 主语 + must + 动词原形 Students must finish homework on time. 表示：禁止 mustn't 句式结构 主语 + mustn’t（= must not）+ 动词原形 Children mustn’t play with fire. Presentation Presentation 情态动词must 表示：肯定推测 must 句式结构 主语 + must + 动词原形 She must be at home. The lights are on. 表示推测时，用于肯定句中。与can表示推测时有区别，can用于否定句中。 疑问句用法 Must + 主语 + 动词原形？ Presentation 情态动词must Presentation 疑问句用法，答语 Must I hand in the report today Yes, you must. No, you needn’t /don’t have to. 肯定 答语 否定 答语 否定回答不用mustn't Presentation Presentation 表示：必须做某事 情态动词have to have to 句式结构 主语 + have to + 动词原形 She has to wear a uniform at school. 第三人称单数现在时：has to Presentation Presentation 情态动词have to 时态变化 Presentation 否定句 Presentation 情态动词have to have to 句式结构 don’t /doesn’t /didn’t + have to（表示 “不必”）She didn’t have to attend the meeting. doesn’t have to 只用于一般现在时 Presentation Presentation 情态动词have to 疑问句 have to 句式结构 Do / Does / Did + 主语 + have to... Do we have to bring our ID cards Yes, we do. No, we don’t. 肯定 答语 否定 答语 Presentation have to must 强调重点 客观要求（外部压力） 主观意愿（个人决定） 时态变化 有（has to /had to 等） 无（只有现在时形式） 否定含义 don’t have to（不必） mustn’t（禁止） 例句 I have to pay taxes.（法律要求） I must study hard.（自己决定） Presentation 情态动词have to与must 的区别 Presentation Presentation 情态动词should 表示：建议、劝告 should应该做某事 句式结构 主语 + should + 动词原形 You should eat more vegetables. Presentation Presentation 情态动词should 表示：义务、责任 should应该做某事 句式结构 主语 + should + 动词原形 You should respect your parents. Presentation Presentation 情态动词should 表示：推测、预期 should应该会 句式结构 主语 + should + ... ...
