must be.
must have been.
must come and visit.
must really enjoy.
must have snowed.
must be snowing.
must have been snowing.
must have had.
must have.
must have worked.
must work.
must be reading.
must have been studying.
Голицынский, 7-е издание – Модальные глаголы – Упражнение 534
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