jakie funkcje

jakie funkcje sa w tych zdaniach?
a)You really must come and see us next time you are in town.
b)I must stop biting my nails.
c)She must be George's sister.
d)You must see the new film at the Odeon.
e)New arrivals must report to immigration control.

>a)You really must come and see us next time you are in town. - strong suggestion
>b)I must stop biting my nails. - personal necessity/obligation
>c)She must be George's sister. - logical conclusion
>d)You must see the new film at the Odeon. - strong suggestion
>e)New arrivals must report to immigration control. - non-personal necessity/obligation