grammar--.ppt

* Modal verbs 表示说话人的语气 没有人称和数的变化,但是有时态的变化 basic modal verbs 基本情态动词 can could may might must shall should will would Unit 1 ought to have to need dare Unit 2 Test yourself 测一测 Coco, you _____play with the knife, you ____hurt yourself. won’t; can’t B. mustn’t ; may C. shouldn’t ; must D. can’t ; shouldn’t ---Will you stay for lunch ? ---Sorry , _____. My brother is coming to see me . I mustn’t B. I can’t C. I needn’t D. I won’t Test yourself 测一测 Are you coming to Jeff’s Party ? I’m not sure. I ____go to the concert instead. A. must B. would C. should D. might When he was there, he ____go to that coffee shop after work. A. would B. should C. had better D. might Learn Modal Verbal 学一学 _____you speak English ? Man _________live without air. Can cannot Can ability 指有能力做某事,意为”能够” Can I smoke here ? Perhaps we can go out for a walk. permission 表示请求,允许 Could 表示过去的能力 表示请求更加委婉 He could swim when he was 5. Could you lend me some money ? can / could 与 be able to 的区别 be able to 表示”某事已做成功”，相当于succeed in doing sth. 考点 The fire spread fast, but everyone in the hotel was able to get out. can与could 可用在疑问句中表示可能性,但这中可能性不大. Could she take away my book just now? 注意can 的惯用语 On hearing the story , I cannot help laughing . You cannot be too careful with them. cannot help + 动名词 忍不住做某事 cannot too “无论怎么样..也不为过,越…越好 may 和 might 用may I …征询对方许可,在文体上比较正式. 但在日常口语中,特别在现代口语中,用can I ..征询对方意见更为常见. May I smoke here? Can I smoke here ? May 表示可能性,用于推测,暗指不确定 He may know Tom’s address. He may be waiting for you at the station. They may have got lost. 考点 当句中出现” I am afraid, I am not sure” 等表示不确定 含义的时候,常选用may 和might . I may go, but I am not quite sure. I am afraid he might not come to attend the meeting today. 从语气上判断,may 所表示的可能性比might 大一点,而might 表示较多的怀疑. He may be very busy now. (可能性较大）． He might be very busy now. (可能性教小）． Will 和would will would I will never do that again. I will do all I can to he