Unit 6 Space and Beyond Grammar课件 2023-2024学年高二英语外研版（2019）选择性必修第四册

外研选择性必修 第四册 Unit 6 Period 2 Grammar 1 2 To review the usage of modals To use modals correctly 学习目标 Activity 1: Look at the sentences from the reading passage and answer the questions. 目标一:To review the usage of modals a Millions watched that first lunar landing... aware... of the many things that could go wrong. b The world went into shock, most people having assumed that this space flight would be no more dangerous than travelling in an aeroplane. c I can remember that day so clearly, watching the take-off on TV at school, ... d The sacrifice of the Challenger calls to us, reminding us that we must continue to reach for the stars, ... 1 Which sentence talks about ability?2 Which sentence talks about possibility?3 Which sentence talks about necessity?4 Which sentence talks about prediction?5 What other modals do you know? What do they indicate? c a b d shall, should,... Now look for more sentences with modals in the reading passage. 1 With the eyes of students across the nation upon her, she might have inspired an entirely new generation of astronauts and space scientists.2 But there was never any doubt that manned flights would continue, ... 【语法详解】 1. can, could(1)表示能力(体力、知识、技能)。*Can you lift this heavy box? *Mary can speak three languages. *Can you skate?此时可用be able to代替。can只有一般现在时和一般过去式; 而be able to则有更多的时态。I’ll not be able to come this afternoon. 当表示“经过努力才得以做成功某事”时应用be able to, 不能用can。*He was able to go to the party yesterday evening in spite of the heavy rain. (2) 表示请求和允许。*—Can I go now? —Yes, you can. /No, you can’t. 此时可与may互换。在疑问句中还可用could, might代替, 不是过去式, 只是语气更委婉, 不能用于肯定句和答语中。*—Could I come to see you tomorrow? —Yes, you can. ( No, I’m afraid not. )(3) 表示客观可能性(客观原因形成的能力)。*They’ve changed the timetable, so we can go by bus instead. *This hall can hold 500 people at least. (4) 表示推测(惊讶、怀疑、不相信的态度), 用于疑问句、否定句和感叹句中。*Can this be true? *This can’t be done by him. *How can this be true? 2. may, might (1) 表示请求和允许。might比 may语气更委婉, 而不是过去式。否定回答时可用can’t或mustn’t, 表示“不可以, 禁