What is the difference between must and should?

Definitions

- Used to express a strong obligation or necessity. - Used to indicate a requirement or rule that must be followed. - Used to express a firm belief or conviction about something.

- Used to give advice or make a suggestion. - Used to express an expectation or likelihood of something happening. - Used to indicate a desirable or recommended course of action.

List of Similarities

  • 1Both must and should express a level of obligation or expectation.
  • 2Both can be used to give advice or make a suggestion.
  • 3Both are modal verbs that indicate a degree of necessity or desirability.

What is the difference?

  • 1Degree of obligation: Must expresses a stronger sense of obligation or necessity than should.
  • 2Certainty: Must implies a higher degree of certainty than should.
  • 3Formality: Must is more formal than should.
  • 4Connotation: Must can imply a negative consequence for not following the obligation, while should is more suggestive and less forceful.
  • 5Usage: Must is often used in rules, regulations, and laws, while should is more commonly used in advice, suggestions, and recommendations.
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Remember this!

While both must and should express a level of obligation or expectation, the difference between them lies in the degree of obligation, certainty, formality, connotation, and usage. Must is stronger and more formal, implying a negative consequence for not following the obligation, while should is more suggestive and less forceful, often used in advice and recommendations.

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