could anybody help me please. I am a level 3 TA. There are three of us and we cover classes. One of the TAs says that we should only cover classes in cases of emergency and 'cover' is all we should do. Of course we know that means helping the children where necessary. But we are told by the deputy head which classes need covering weeks in advance and then left with the planning for us toget on with the class. Which is correct?