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1. He must know a few foreign languages.
2. He must be working about this problem now.
3. They must be enjoying this beautiful weather at the moment.
4. She must be trying to find the old letters.
5. They must be admiring the beauty of the South's nature at the moment.
6. He must have returned from the South.
7. She must have lost my adress.
8. They must have finished their work.
9. He must have told everything in court.
10. She must have prepared it all in advance.
11. He must still be here somewhere.
12. They must have just come.
13. He must have brought the papers along with him.
14. Somebody must have already been here.
15. He must be laughed at.
16. They must have been living here then.
17. It must be raining.
18. This must be here.