I cannot believe that I, a high school student, had to come and explain this to you guys. "to be verbs" are not the actually words, "to be." To be verbs consist of, am, are, is, was, were, be, being, and there are more. When your teacher told you to replace these, she means that you need to come up with some more interesting, college level, verbs for your paper. Oh and here's a little life lesson for you, next time you do not wanna get owned by a high school student, how bout you try google?