1. They must be living in St. Petersburg
2. They may be living in St. Petersburg
3. They might be living in St. Petersburg
4. They cant be living in St. Petersburg
5. They must have lived in St. Petersburg
6. They may have lived in St. Petersburg
7. They might have lived in St. Petersburg
8. They couldnt have lived in St. Petersburg
9. He cant be at work
10. He must have been at work
11. He may be at work
12. He may have been at work
13. He might be at work
14. He might have been at work
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