Past modals tell what could have, would have, and should have happened. To form these past modals, use could, would, or should followed by have, followed by a past participle verb. Use have for all pronouns; never use has or had to form a past modal.
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Modals past tense
Past modals tell what could have, would have, and should have happened. To form these past modals, use could, would, or should followed by have, followed by a past participle verb. Use have for all pronouns; never use has or had to form a past modal.
Explanation: