高考英语语法——情态动词（共29张PPT）

高考英语语法 情态动词 can/could 表示能力，can表示能力时可与be able to互换，表示经过努力而成功地办到了某个具体是事情时，只能用be able to，不可用can，这种用法的be able to相当于manage to和succeed in。 Can you understand the meaning of the word? Are you able to understand the meaning of the word? He could swim across the river. He was able to swim across the river. After great efforts, he was able to make great progress in his work. 表示“许可”，这种用法相当于may，could语气比can更加委婉。 You can help yourself at my home. You could contact us in order to book a room. 表示可能性，常用于疑问句和否定句中，表示“有可能或绝对不可能”；在肯定句中要用may或must。 Can the answer be right? He can't/couldn't have turned off the light. There can't be any person beyond law in China. He could have passed the driving test. Can he have come back? can表示多种情绪，如困惑、不解、不满、不耐烦等。 What can it mean? （困惑） What can make her angry? （不满） Where can the boy run? （不解、困惑） How can you say like this? （不耐烦） may/might 表示许可、允许，常译为“可以”。 You may overnight in my family. People may not throw rubbish in the street. 表示推测可能要发生的事情，常用在肯定句和否定句中。 He may come here