《IT职业英语》-电子教案-高巍巍 YF-Grammar 语法 unit9 Modal verbs情态动词.ppt

Grammar 语法,Unit 9 Modal verbs情态动词,一、情态动词的定义,情态动词用来表达说话者对主要行为动作的态度的如：能力、责任或义务、建议、许可、可能性等二、情态动词的形式,尽管情态动词有现在和过去两种形式，但是情态动词没有时态的区分情态动词的现在形式指现在和将来；情态动词的过去形式指过去、现在和将来情态动词的完成形式也存在，也指过去、现在和将来注意：一般疑问句形式是情态动词提到主语前面（倒转）三、情态动词的用法和例句,能力: can, could, be able to I can use C++. I am able to use a computer. I could use C++ when I was ten.,,责任或义务: (rules and laws) must/have to, mustn’t, can’t, should, shouldn’t, couldn’t (personal authority) must/have to, mustn’t, can’t, will, won’t, shall, shan’t 责任或义务的否定形式: (rules and laws) needn’t/don’t have to, can, may (personal authority) must/have to, mustn’t, should, shouldn’t,,,,建议: must (strongest), should (strong), ought to (less formal), could (for general advice),,,许可: may, can, might, could (might: very formal; may: formal can: informal & less polite),,可能性: will, must, should, may, might, could, can (will: most certain; might/could: least certain),,,Exercise,Fill in the gaps with an appropriate modal verb: 1. Sandy __________ drive but she doesn’t have a car. 2. I used to __________ stand on my hands but I can’t do it now. 3. My grandmother was an intelligent woman. She __________ speak 6 languages. 4. Passengers __________ go through the security check at the airport.,,5. You ___________ smoke in the non-smoking area. 6. I can stay in bed late because I __________ work tomorrow. 7. It is late. I __________ go now. 8. Driving a motorbike without wearing a helmet is dangerous. He __________ wear a helmet.,,9. She is feeling sick. She ate too much. She __________ have eaten so much. 10. __________ I use your computer? Mine is not working. 11. Claire __________ get bored in her job. She does the same thing every day. 12. The boss should be here before 9:30. It’s 10 now and he never comes late. He __________ be coming.,Thank you!,。