1. Americans tend to equate "Change" with "improvement" and consider a rapid change as normal.
2. This song is believed to have been sung by the well-known choir.
3. He ordered the windows to be shut.
4. She ought to be visiting you yesterday, but she fell ill.
5. They must be walking in the garden now.
6. I meant to answer the letter last week, but I forgot.
7. This article must have been translated by a second-year university student.
8. I am so glad to be meeting you.
