obligation (from the speaker’s point of view)
E.g. Any real body must have extension in four directions: it must have Length, Breadth, Thickness, and – Duration.
In different contexts must may acquire additional shades of meaning, such as duty or necessity.
In this meaning must is found in affirmative and interrogative sentences and followed only by the simple infinitive.
Prohibition
E.g. He must not leave his room for a while. (Он не должен (ему нельзя) выходить из комнаты некоторое время).
This meaning is expressed in negative sentences and must is also followed by the simple infinitive.
emphatic advice
E.g. You must come and see us when you’re in London.
You must stop worrying about your son.
You mustn’t give another thought to what he said.
You mustn’t miss the film. It is very interesting.
You must have your hair cut.
It is much too long. You mustn’t cry.
“Andy” – she spoke in a quick, low voice – “of course you must never tell anybody what I told you about Canby yesterday.” (F. Scott Fitzgerald)
This meaning is found in affirmative and negative sentences and is closely connected with the two above mentioned meanings.
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