Employees must/have to sign non-disclosure agreements (NDAs) to protect sensitive company information.
have to
Employees mustn't / don't have to attend the optional team-building workshop this weekend if they are snowed under with work.
don't have to
You mustn't/don't have to wear clothing that is offensive or inappropriate in the workplace.You mustn'tdon't have to wear clothing that is offensive or inappropriate in the workplace.You mustn'tdon't have to wear clothing that is of
mustn't
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