I have / she has to... Do not you / does not he have to... Do we have to...?	"Have to" reffers to a duty or obligation, it is not always something that we want to do.	I have to brush my teeth twice a day. She does not have to study for the test. Does he have to wash the dishes?
I must... He must not (Mustn't)... Must you...?	It is about suppositions, needs or commitments.	I must pay some taxes. You must not be late tomorrow. Must she get home early?
She can... I can not... Can they...?	Express ability or possibility.	I can speak English. Laura can not fly. Can you help me?
You should... It should not... Should Charles...?	It is used for expressing suggestions or pieces of advice.	You should go to the doctor. He should not waste water. Should I sleep early?

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Have To, Must, Should And Can.