Modals (also called modal verbs, modal auxiliary verbs, modal auxiliaries) are special verbs which behave irregularly in English. They are different from normal verbs like "work, play, visit..." They give additional information about the function of the main verb that follows it. They have a great variety of communicative functions.
Hola profe, como no tengo el word todavia hice el trabajo en un google drive asi que te paso el link. [+]
English Homework - Federico Dardik - Past Simple and Past Continuos [+]