Не is very old. Не must be nearly eighty.
It must be time to go now.
They must have changed the school curriculum. My granddaughter knows a great deal more than I did when I was her age.
It must be a very difficult rule.
It must be pleasant to spend summer in such a picturesque place.
You must have read books by this author before.
They must be preparing a surprise for us.
These old legends must have been composed about a thousand years ago.
It must be nine o’clock now.
You have been absent very long. You must feel hungry.
Where are the children? — They are at the river with Nick. They must be having a very good time.
He must have worked very hard to finish his book.
She is a very experienced doctor. She must have been working at this hospital for at least fifteen years.
Look! Helen’s windows are open. She must be at home.
The Smiths have always been great football fans. They must be at the stadium watching the football match.