1. I could not go to the theatre with them last night, I had to revise the grammar rules and the words for the test.
2. My friend lives a long way from his office and has to get up early.
3. All of us must (ought to) be in time for classes.
4. When my friend has his English, he has to stay at the office after work. He needn't stay at the office on Tuesday, Thursday and Saturday and can get home early.
5. Do you have to work hard to do well in your English?
6. «Must we discuss this question now?» No, we needn't. We can do it tomorrow afternoon.
7. I’m glad you can come.
8. «Would you like to come and have dinner with us tomorrow? “I’d love to.” 9. “Please send them this article.” “Oh must I do it now?”