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certainly. A. Do B. May C. Shall D. Should B 6. I was really anxious about you. You ___ home without a word. A. mustn’t leave B. shouldn’t have left C. couldn’t have left D. needn’t leave B 7. — Are you ing to Jeff’s party? — I’m not sure. I __ go to the concert instead. A. must B. would C. should D. might D 8. Sorry, I’m late. I ____ have turned off the alarm clock and gone back to sleep again. A. might B. should C. can D. will A 9. — When can I e for the photos? I need them tomorrow afternoon. — They ___ be ready by 12:00. A. can B. should C. might D. need B 10. The fire spread through the hotel very quickly but everyone ____ get out. A. had to B. would C. was able to D. could C11. When he was there, he ___ go to that coffee shop at the corner after work everyday. A. would B. should C. had better D. might A 12. I wonder how he __ that to the teacher. A. dare to say B. dare saying C. not dare say D. dared say D 。用于第一、三人稱。如: ? Accidents can happen. Anybody can make mistakes. can / be able to can / be able to ability ?在過去時(shí)態(tài)的肯定句中需要某種條件或努力做成某事 ,我們要用 was/ were able to而不能用 could。 ability certain