UNIT 2 Section Ⅲ Using language（课件PPT）-【新课程学案】新教材2023-2024学年高中英语必修2 （外研版）

Section Ⅲ　Using language NO.1 NO.2 NO.3 语法专区/落实“形式”—意义 —使用“三维动态语法观” 听说专区/在主题活动中提升语言技能 新知学习/核心语言点集中释解 目 录 语法项目——情态动词(2) 初识语法——在美文运用中体悟 背美文 　　Today, a new student came to our class and our teacher let him sit next to me. He smiled at me when he sat down. I thought to myself he couldn't be difficult to get along with. When having English class, I noticed that he kept frowning. He may lose to catch what the teacher said. After class, I told him I could help him with his English after school. He must be surprised at my words, for it took him a few minutes to make a response. 续表 悟语法 　　加黑部分的情态动词都表示推测，其中must的语气最为肯定，may的语气较弱，couldn't表示否定推测，否定语气强烈。 慧学语法——在归纳演绎中学通 一、情态动词表示推测的用法　 [先感知] ①(教材典句)The children must have been very excited as they opened it. ②You can't be hungry, for you had lunch only two hours ago. ③He couldn't have watched TV yesterday, for he knew he would have an exam. ④(教材典句)Who could it be from? ⑤The little problems that we meet in our daily lives may be inspirations for great inventions. ⑥(教材典句) ... they might not receive their presents if they were not good. [会发现] (1)must表示推测时只用于肯定句中，句①中的must have done表示对_____的推测。 (2)can/could也可以用来表示推测，在否定句中用来代替must。句②和句③中的can't和couldn't表示“_________”，句④中的could表示“______”，注意此时could不能表示对过去的推测，_____________才能表示对过去的推测。 (3)may和might表示推测时语气较弱，且might相比may语气更为不确定。 过去 不可能 可能 could have done [明规则] 1．表示推测的基本用法 ①must只能用于肯定句中，意为“一定；必定”，否定句中要用can/could。 ②can/could用于疑问句中，意为“可能”；用于否定句中，意为“不可能”，语气强烈。 ③may/might用于肯定句中表示不十分肯定的推测，意为“有可能”；用于否定句中意为“可能不”，表示一种不太确定的语气。 2．表示对现在的推测用“情态动词＋do”，表示对过去的推测用“情态动词＋have done”。 3．表示推测时，must的语气最强烈，can/could not表示否定推测，否定语气强烈， may的语气较弱，might的语气最不确定。 4．might和could均可表示“可能性”，在肯定句中二者意思相近，用于否定句时二者含义不同，could not＝can not，表示“不可能”，语气强烈。 5．should也可以表示推测，且常表示有依据或有前提的推测，意为“按说应该……”，语气仅弱于must。 如： It is already 10 o'clock now. They should be there. 现在已经十点了。他们按说应该到了。　 [对点练]　(用适当的情态动词或所给单词的适当形式填空) ①—It ______ be John who is in the office. —No, it ______ be him. I saw him off at the airport half an h