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Should is weaker; it's used in advice. - Expected Result/Probability/Predictions/supposition
Must is stronger; it's used in orders. - Requirement/Strong Obligation/necessity/compulsion
Have to is a modal almost like, of must
He doesn't have to leave. ≠ He must not leave. The first one means he has no obligation to leave, but the second means he has an obligation not to leave
All the three are used to express 'obligation' but with different shades of meaning.
'Should' is used to mean "suggestion" and the action is left to the discretion of the person, meaning if the action is performed, it is good.
1. You should take regular exercises.
It also means probability.
2. It's an off day today. George should be at home.
If it begins a sentence, 'should' refers a condition (meaning 'if')
3. Should you be late, give me a ring.
'Must' is used to express compulsion, meaning it is the only choice.
4. You must take regular exercises because you're putting on weight.
It is also used to express probability bordering on sureness.
5. It is an off day today. George must be at home.
Has to/have to are used to express compulsion arising out of force. There's no choice given.
6. I have to finish the work today. The deadline is approaching.
7. He has to leave right now!
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must order
should for help or advise some one
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I agree with specialties answers
There is a difference between these words. Should means that it is a good idea to do something. It is more of a recommendation or an instruction to do something.
Must means that it is absolutely necessary that you do something. You don't have a choice in the matter and it is not a recommendation. It is a command.
The words "should" and "have to" or somewhat similar. However, "should" is more of a recommendation and "have to" is more of an obligation.
Should
Expected Result/Probability/Predictions/supposition
Stock prices should increase in the next few days.
Recommendation or Suggestion
He should be an engineer
Weak obligation/duty/propriety/necessity
I should work out more often
Must
Requirement/Strong Obligation/necessity/compulsion
Firemen must be ready for action at anytime.
Students who want to go to college must take more science courses
A Conclusion/high probability/conjecture/certainty/inevitability
He must not have been sick
Have to
Requirement/Strong Obligation/necessity/compulsion
Firemen have to be ready for action at anytime.
A Conclusion/high probability/conjecture/certainty/inevitability
He has to be a doctor [in reaction to his ability]
There is a difference between these words. Should means that it is a good idea to do something. It is more of a recommendation or an instruction to do something.
Must means that it is absolutely necessary that you do something. You don't have a choice in the matter and it is not a recommendation. It is a command.
The words "should" and "have to" or somewhat similar. However, "should" is more of a recommendation and "have to" is more of an obligation.
