18. He has been living by herself since her divorce.
19. I was angry that I had made such a stupid mistake.
20. I predict that by 2020, man will have landed on Mars.
21. He quit his job a couple of years ago. 
22. Our daughter has not graduated from the university yet.
23. They didn’t send any Christmas cards last year. 
24. She goes to a doctor once a year for an examination.
25. They were talking about me when I interrupted their conversation. 
26. Nothing much was happening when I got to the meeting.