(2)表示许可: can/could, may/might;cant,may not. mustnt. must not ●1)征询“许可”或给予“许可”可用 can/could或 may/might表示 May用于正式场合,can用于非正式场合, could用于客气的询问 might极少用。 You can go at four o'clock Could i borrow your pen? Students may take 3 books each o Might I ask whether you are using the typewriter? ●2)表示“不允许”用cant, may not, mustn t; must not语气重。 You cant leave the table unless you finish your meal Put that cigarette out. You must not smoke near a petrol pump 3)表示过去“许可”不用 could, might,要用其他表达方式 We had been/were given permission to speak to the patient 但在间接引语中表达过去“许可”,可用 could, might The nurse said that we could/might speak to the patient for just a few minutes(2) 表示许可：can/could, may/might; can’t, may not, mustn’t, must not ⚫ 1) 征询“许可”或给予“许可”可用can/could 或may/might 表示。 May 用于正式场合，can 用于非正式场合，could 用于客气的询问， might 极少用。 ⚫ You can go at four o’clock. ⚫ Could I borrow your pen? ⚫ Students may take 3 books each. ⚫ Might I ask whether you are using the typewriter? ⚫ 2) 表示“不允许”用 can’t, may not, mustn’t； must not 语气重。 ⚫ You can’t leave the table unless you finish your meal. ⚫ Put that cigarette out. You must not smoke near a petrol pump! ⚫ 3) 表示过去“许可”不用could，might，要用其他表达方式。 ⚫ We had been/were given permission to speak to the patient. ⚫ 但在间接引语中表达过去“许可” ，可用could，might。 ⚫ The nurse said that we could/might speak to the patient for just a few minutes