Essential Words

Most Essential:

Articles:
              a, an, the

Forms of the verb be:
              am, are, is, was, were, be, been, being

Auxiliary (Helping) Verbs:
              did, do, does, doing
              had, has, have, having
              can, may, might, must
              could, should, would
              shall, will

Pronouns:
              I, you, he, she, they, it

Conjunctions:
              and, but, or

Interrogatives:
             who, whom, whose, which,
             what, when, where, why