This document discusses modal verbs in English and their meanings. It provides examples of how to use common modal verbs like can, can't, be able to, could, might, may, must, have to, and should. Can is used to ask for permission, can't expresses inability, be able to expresses ability, could expresses past ability, might expresses possibility, may asks for permission, must expresses obligation, have to expresses obligation, and should expresses recommendation.