Obligation and freedom to act – future and past

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Positive
ModalPastFuture
1aMustCannot use must Use rule 2aCannot use must Use rule 2a
2aHave tohad towill have to
3aNeed toNeeded towill need to
4aShouldShould haveshould
5aOught toOught to haveought to
6abe allowed towere allowed towill be allowed to
7aCancouldCannot use can Use rule 6a

 

Negative
ModalPastFuture
1bMust notCannot use must Use rule 6bCannot use must Use rule 6b
2bDo not have todid not have towill not have to
3bNeed not/ do not need todid not need towill not need to
4bShould notShould not haveshould not
5bOught not toOught not haveought not to
6bNot allowed towere not allowed towill not be allowed to
7bCannotCould notCannot use cannot Use rule 6b

 


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