51. Anna may know his house.
52. Y Vy u would like a cup of coca.
53. She had better sit down.
54. It must have been a terrible experience for her boyfriend.
55. She was able to finish all her work.
56. Thuy Duong didn't have to clean the floor.
57. Your report has to be on my desk tomorrow afternoon.
58. Drivers are not allowed to drink beer while driving.
59. Duan can't jog in such cold weather.
60. John might not receive my letter.
