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. (U biroz vaqt uyini tark etmasligi kerak).
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.
This meaning is found in affirmative and negative sentences and is closely connected with the two above mentioned meanings.
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