11 may Modal Verbs 11/05/2022 Tips for improving your written and oral english Modals are different from normal verbs: 1: They don't use an 's' for the third person singular.2: They make questions by inversion ('she can go' becomes 'can she go?').3: They are followed directly by the infinitive of another verb (without 'to'). Probability:First, they can be used when we want to say how sure we are that something happened / is happening / will happen. We often call these 'modals of deduction' or 'speculation' or 'certainty' or 'probability'. For example: It's snowing, so ... Leer más