Certainty and deduction – future and past


Modal Past Future
1a will will/would have will be
2a must must have
3a should should have should be
4a ought to ought to have ought to be
5a might might have might be
6a could could have could be
7a may may have may be


Modal Past Future
1b will not will/would not have will not be
2b must not must not have
3b should not should not have should not be
4b ought not ought not have ought not be
5b might not might not have might not be
6b could not could not have could not be
7b may not may not have may not be

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