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3th conditional

impossible actions and actions that never happened

modal verbs

condition

result

past perfect

modal verb (+)

present perfect

if + pronoun + had + verb in participle

pronoun + modal verb + have +verb in participle

if I had studied, i would have passed the exam

they could have fixed the car if they had had the tools

if I had known you were comming, I would have baked a cake

could, would and should