MODAL VERBS
by Virley velasco
1. Must + have+ past participle
1.1. Positive deduction about the past.
2. Can´t/Couldn´t+ have+ past participle
2.1. Negative deduction obout the past.
3. Should/Ought to+ have+ past participle
3.1. To express regret or criticisn about an action or somebody´s behaviour in the past.
4. May/might+ have+ past participle
4.1. Perhaps something happened but we are not sure
5. Could+havee+past participle
5.1. To express unfufilled possibility
6. needn´t+ have+ past participle
6.1. Something was not necessary but it was done.
