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Can, could, will, would, may, might, must, should and ought to.

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-Speculation in past: must
-Probabilities in past:  can, could, may, might
-Recomendation/Obligation in past: should
-Future: will

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Here there is some extra information that may help you.

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Practice the structure of past modals tense and form some examples at home.

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Write your own sentences, based on the example given, one for each case.

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Peter failed the course last month

Speculation
He must not have studied for the exams.
Probability
He could have lost his parents' support.
Recomendation
He should have studied hard in order to not to fail the course.
Future
He will have finished the course in the next two months.

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Enter the website and complete the activity in order for you to practice.

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Could Have Should Have Would Have Exercise 1

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Could have should have would have. Past modals exercise

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Let me know your doubts. Write your questions in this text box.