Modal 1)__________ are special verbs which behave irregularly in English. They give additional information about the 2) _________ of the main verb that follows it. They have a great variety of communicative functions. The modal 3) ___________ expresses a general ability while 4) ___________ describes a past ability and expresses reported speech for can. On the other hand, the modal 5) ___________ expresses possibility, request or ask for permission and give permission