1 I think you should buy this book.
2 He need not take the exam again.
3 Terry is sure not to be at the office.
4 Janet may call me this evening.
5 You may not eat and drink in the classroom.
6 We have to clock in at 8.30.
7 The boys are sure to have not been upset with the results.
8 May I do anything to help?
9 We may go for a picnic on Sunday afternoon.
10 Sam was able to reach the top of the mountain after climbing for several hours.
11 Can you throw a party on your birthday?
12 John had to attend the seminar.
13 They have to go to a meeting every day.
14 Should we visit some friends on Saturday?
