Final answer:
The correct expressions of the statement in if-then form are: 'If a person does not pass a comprehensive exam, then that person cannot obtain a master's degree.' and 'If a person passed a comprehensive exam, then that person obtained a master's degree.'
Step-by-step explanation:
The correct expressions of the statement in if-then form are:
- If a person does not pass a comprehensive exam, then that person cannot obtain a master's degree.
- If a person passed a comprehensive exam, then that person obtained a master's degree.
These expressions correctly represent the necessary condition for obtaining a master's degree, as passing a comprehensive exam is required in order to obtain the degree.