八年级英语上：Unit 13 Safety Rules Part 3课件北京课改版.pptVIP

要求某人做某事时,可以用You must do sth. 或Remember to do sth. 例如: Summary and Exercises 2.情态动词must表示“应该”“必须”。否定形式 must not（mustn’t),表示“不应该”“不允许”“不准”等。本单元mustn’t的主要用法是表示禁止和警告。在回答must的问句时，肯定回答是Yes, you must.否定回答是 No, you need not (needn’t). 表示“不必”,而不用mustn’t。 * Unit 13 Safety Rules Part III Language In Use Revision Grammar Focus I Practice I Grammar Focus II and Practice II Grammar Focus III and Practice III Summary and Exercises Homework v For students who come to school on foot, they can_______________ when the light is green. They must _________________________ before they cross the road. v For students who come to school by bike, they must ____________________. They should ___________ across the crosswalks and in school. cross the road look both right and left stop for the red light walk the bike Basic traffic rulers For students who come to school by bus, they must _______________, _______________ and _____________________________. They mustn’t _________ at the bus stop. When the bus arrives, they must ____________first and __________________________. They must _______________ to get on the bus. On the bus, they must _____________ and mustn’t ________________________________________ . arrive on time wait quietly stay away from the road way fight check traffic wait for the driver’s signal form a signal line stay in the seat put any part of the body outside the window You must obey the traffic rules. You must stop for the red light. You mustn’t put your head out of the bus windows. You mustn’t play football on the roadway. Grammar Focus I Read and understand Write down what these signs mean. You mustn’t stop here. You mustn’t swim here. You mustn’t smoke here. You mustn’t turn left. You must stop here. You must drive at 40 kilometers . Look and use must or musn’t make sentences. come home after school, play computer games outside You must _____________