A word that denotes action or motion is called a Verb. Whenever we add ed to the end of a verb to indicate past tense, we call them Regular or Weak Verbs, such as worked, talked, strolled, lifted.

Verbs that undergo an internal change in order to indicate past tense are called Irregular or Strong Verbs, such as bought, broke, grew.

Auxiliary Verbs are helping verbs, that is, they assist in making a verb phrase indicate definite time. The auxiliaries are: be, am, are, is, was, were, shall, should, will, would, may, must, can, could, have, had, has, been.

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