must (obligación fuerte), You must study for the exam., should (consejo), You should eat healthier food., could (habilidad o posibilidad), She could run very fast when she was young., must have (deducción en el pasado), They must have left earlier., should have (crítica / arrepentimiento), You should have called me., could have (posibilidad pasada no realizada), He could have won, but he didn’t try..

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