If im not mistaken S-t-e-a-m-boat a-comin is an example of Dialect. if im wrong sorry but i am 90 percent sure its D well 99 percent sure.
Comparison/Contrast is the structure used:)
A cook who is doing a quilaty check on the serving lines by tasting sauces and sides must <u>be a chef</u>
A C-R-A-P-E is the other word that represents the black veil
that would be preposition