电大英语幻灯片.ppt

must的主要用法是 A) 表示“必须”, “应当”: eg. You must finish the work. The monitor told us we must wait at the school gate at six. B) 表示说话人对事物的推测: “一定” “准是” eg. The old lady must be near seventy. The runners must be very tired. 注意: 1. 对以 Must 开头的疑问句的否定回答不使用mustn’t ,因为 mustn’t 只能表示“不许” “不准” eg. --- Must I come to the meeting ? --- Yes, you must. --- No, you needn’t. 2. 下面三句话均表示 “不允许……”, 但语气不同. can’t , may not , mustn’t 三者的否定语气依次递增: eg. People can’t smoke here. People may not smoke here. People mustn’t smoke here. * * RTVU ENGLISH 电大英语 电大：张琳 电大英语本单元的主要语法内容是: 情态动词 can, could, may, might, must Look at the advertisement below for a maid. MAID WANTED The parents of a four-year-old girl want a maid for housework . Can you do these jobs ? We need someone who : can clean can cook can iron clothes can mend clothes can read and write well But we also need someone who: can speak Cantonese can cook Sichuan food can look after a little girl Are you the person we are looking for ? Then write to Guo Yikai and Kong Yunhua for details. 文中的黑体部分是情态动词 can+ 动词原形. 情态动词是表达说话人的语气或情态的动词. 它们可以表示命令,允诺,请求,愿望,推断,义务等一系列感情色彩. can, could, may, might, must 是几个常用的情态动词. Can 的主要用法是: A) 表示体力或脑力的能力 eg. The girl can type very fast . Can the child read and write ? B) 表示说话人的推测, 事物的可能性 eg. Where can Mary be ? Can the news be true ? C) 在口语中, can可以表示 请求或允许 eg. Can I sit here ? You can go now . 根据上述语法注释, 用A或B标出下列句子中can的不同用法 1) Travelling by sea can make you sick . ( ) 2) He is very clever but he can’t remember anything . ( ) 3) He can read book in French, German and English . ( )