past modals - implies something was possible, permitted, obligated or able to be done in the hypothetical sense, but didn't actually happen., have - key word in past modals, function - they are used for speculation, formula of may - may + have + verb in past participle, 90-100% sure it is true - must, 50% sure it is or is not true - may and might, not very sure of it - could, evidence - we need it for some sword of context, modal verbs - an auxiliary verb that expresses necessity or possiblity, types of modal verbs - ability, permission, likelihood, obligation and advice modals., when can we use them? - to tell what could have happened in the past, formula of must - must + have + verb in past participle, formula of could - could + have + verb in past participle, formula of might - might + have + verb in past participle, formula of should - should + have + verb in past participle, advice modals - should, permission modals - can and may, obligation modals - must and have to, ability modals - can and could, likelihood modals - might,

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