OBLIGATION
EX: You have to be in class at 7 am
ABILITY
EX: I can swim
PERMISSION
EX: Can I leave now?
REQUEST
EX: Could you open the window please?
ABILITY IN PAST
EX:My sister could dance for hours when she was 15 years
WEAK PROBABILITY
EX:It might rain today.
OBLIGATION
EX: you must eat healthly
SPECULATION
EX: She must have problems
NECESSITY
EX: I need to sleep more hours
ADVICE
EX: You hould stop smoking
POLITE REQUEST
EX: May I take your order?
PROBABILITY
EX: It may be open