九年级英语Keeping Safe教案2

unit 8 keeping safe

一. 教学内容：unit 8 keeping safe 二、教学重点：1、must， mustn’t 和have to 的使用2、重点词组 三、具体内容：（一）语法要点：have to和must的区别have to 的用法have to 常表示因客观需要（由于外界因素的限制被迫）必须做某事，有“必须，不得不”的意思. 1. have to 有时态，人称和数的变化. mary had to go to school with her teacher yesterday.2. have to 的否定形式是don’t have to，译为“不必”. you don’t have to go shopping now.must的用法情态动词must是表示人的主观看法. 有“必须，应当”的意思. 1. must 没有时态，人称和数的变化. 2. must 的否定形式是must not，表示“不可，不许”的意思. you mustn’t waste your time.3. must 还可表示说话人对事物的肯定推断，含有“一定，准是”的意思. mr. yin must be over forty now.ex. complete the rules with the correct forms of the verbs from the box。lee junior high school safety rulesall students in this junior high school must follow the safety rules:ride      keep    bring     kn