1) The document discusses modal verbs, which are special verbs that indicate modality and provide additional information about the function of the main verb that follows.
2) It provides examples of 12 common modal verbs - can, could, may, might, must, ought to, shall, should, will, would, neednot, and had better - and their typical uses.
3) The document concludes with a practice activity where students must choose the most appropriate modal verb to complete sentences based on the context provided in parentheses.