Crucigrama Modal verbs Versión en línea Expressing possibility and certainty. por Roselli Tommasi 1 I\'m not sure. I ........ go to the party but I\'m so tired. 2 She ....... know the secret. Anna always trust on her. 3 She ....... pass the exam. Her answers are incorrect. 4 It\'s possible. They ....... have a chance to win. 3 4 2