Kinds of Auxiliaries
    Auxiliaries are mainly two kinds - Primary and Modals
    Primary: Primary Auxiliaries are 3 types -
                  1. to be (am, is, was, were, be, been, being)
                  2. to do (does, do, did, do, done, doing)
                  3. to have (has, have, had, have, had, having)
    Modals: There are thirteen Modal Auxiliaries. These are - shall, should, will, would, can, could, may, might, must, need, dare, ought to, used to