1. I could not go to the theatre with them last night; I had to revise the words for the test.
2. My friend lives a long way to the office and must get up early.
3. All of us must be in time for classes.
4. The lesson is over, you may go now. 5. You don't look too good today, you should see a doctor.
6."Whoever knocks at the door, you must not open it," mother told her children before going out.
7. You don't know any foreign language; you can't apply for this job.
8. Susan cannot come home for lunch; she says she has to finish her work first.
9. Henry is seriously ill; you should visit him in the hospital.
10. I must meet the delegation at the airport.