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Obligation and freedom to act – future and past

	Positive
	Modal	Past	Future
1a	Must	*Cannot use must* Use rule 2a**	*Cannot use must* Use rule 2a**
2a	Have to	had to	will have to
3a	Need to	Needed to	will need to
4a	Should	Should have	should
5a	Ought to	Ought to have	ought to
6a	be allowed to	were allowed to	will be allowed to
7a	Can	could	*Cannot use can* Use rule 6a**

	Negative
	Modal	Past	Future
1b	Must not	*Cannot use must* Use rule 6b**	*Cannot use must* Use rule 6b**
2b	Do not have to	did not have to	will not have to
3b	Need not/ do not need to	did not need to	will not need to
4b	Should not	Should not have	should not
5b	Ought not to	Ought not have	ought not to
6b	Not allowed to	were not allowed to	will not be allowed to
7b	Cannot	Could not	*Cannot use cannot* Use rule 6b**

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Obligation and freedom to act – future and past

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