what you are supposed to do/what you should do/what you ought to do (It often means 'shall', eg shall/should I help you?) sollen to be supposed to, ought, should what you may do/what you are ...

Modal verbs are easy to spot because there are so few of them. In addition to must, shall, will, should, would, can, could, may and might, we can add ought to and have to. If we are told that we ...