Obligation (must) vs Prohibition (must not)

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Obligation (must)

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A requirement or duty to do something. For example, 'You must complete your homework.'

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Prohibition (must not)

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A rule or law that forbids something. For example, 'You must not use your phone in class.'

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Example of obligation

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'Students must arrive on time for class.'

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Example of prohibition

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'Students must not eat in the classroom.'

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Difference between 'must' and 'must not'

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'Must' indicates something that is required, while 'must not' indicates something that is forbidden.

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When to use 'must'

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Use 'must' when giving instructions or rules that are necessary.

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When to use 'must not'

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Use 'must not' when stating rules or laws that should not be broken.

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Consequences of not following obligations

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Not following obligations can lead to penalties or negative outcomes, such as failing a class.

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Consequences of breaking prohibitions

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Breaking prohibitions can result in disciplinary actions, such as detention.

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Synonyms for 'must'

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Have to, need to, required to.