1. All documents have already been sent.
2. If you meet him, do not say anything to him.
3. Upon entering the university, we took off our coats and went to the dining room.
4. When the teacher entered the classroom, he remembered that he had forgotten his cap in the cafe.
5. Leave him alone, he is thinking.
6. Can not you hear me?
7. He is said to have worked here 10 years ago.
8. If you had learnt all the rules necessary to write the test, you would not have any problems with English now.
9. He had finished work by eight o'clock in the evening
10. Students wrote tests, and teachers checked them.
11. I will not be surprised if she does not understand you.
12. The teacher has not yet arrived, and students are waiting for him in the corridor.
13. Everyone realized that he had not prepared the report.
14. No one saw him talking with the dean.
15. When he opened the briefcase, he realized that he had forgotten the documents at home.
16. By three o'clock we had already come home.
17. Our friends have not returned from London.
18. He is considered an intelligent person.
19. I think of going somewhere in a couple of weeks.
20. When she leaving the room, she forgot to turn off the light.