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1、Unit 4 Road safety (Grammar time ) 练习单Task 1. Look and say.We must.How can you cross the road safely? We mustnt. What must you not do on the road？ Task 2. Important and difficult points.(情态动词用法总结)情态动词有can、should、must等，它们后面都是加动词原形。1. can 的用法：（1）表示能力、体力、知识、技能等，能、会。Eg: I can swim well. （2）否定形式cant , 不能
2、、不会、不可以。Eg: I cant skate. （3）表示请求和允许，可以。Eg: Can I go in? 2. should 的用法：（1） 表示责任、义务或建议，应该、应当。 Eg: He should drink water. （2）否定形式shouldnt, 不应该，不应当。3. must 的用法：（1）表示必须。 Eg: You must stop here. （2）否定形式mustnt 表示强烈禁止。Eg: You mustnt swim here. ( 3) 表示推测，只用在肯定句中，有“一定，想必”之意。 Eg: The light in her room is stil
3、l on. She must be at home now.情态动词语气由弱到强should/shouldntcan/cantmust/mustnt情态动词在肯定句、否定句、一般疑问句和特殊疑问句中的用法：肯定句：主语+情态动词+动词原形+其他。否定句：主语+情态动词+not+动词原形+其他。一般疑问句：情态动词+主语+动词原形+其他？特殊疑问句：特殊疑问词+情态动词+主语+动词原形+其他？Task 3. Exercise1. I must _ (finish) my homework before dinner.2. In public, you _ (must) smoke. You ca
4、n _ (smoke) in the smoking room.3. _ (should) Liu Tao speak _(loud) in the library? No, he _.(should)4. -Can Nancy _ (see) the traffic lights? -She mustnt _ (cross) the road now.5. What must they not _ (do) on the road? They mustnt play on the road.6. Where should Tom _ books? He should _ in the study. (read)
