The document provides information about modal verbs in English including:
1) It defines modal verbs as special verbs that behave irregularly and give additional information about the function of the main verb that follows.
2) It lists 12 common modal verbs and provides examples of their uses.
3) It describes some important differences in how modal verbs are used compared to normal verbs, such as not taking "-s" in the third person and using "not" to make them negative.
4) It includes an exercise for students to practice using modal verbs in different contexts.