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 'must ...
Speaker 1: (TO AUDIENCE) So we're writing our end of year reports, for the children that are ready to leave and go to school in September. Speaker 2: (TO OTHER PEOPLE) I'm on the area for improvement ...