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Helping Verbs
           Verbs often use other verbs in sentences. Although a main verb
           represents the important idea of the sentence, it may need a
           helper to express its full meaning. Here are the forms of three
           helping verbs that appear in this chapter:

             to be       am, are, is, was, were
             to do       do, does, did
             to have     have, has, had

           Could, would, and must are examples of a special kind
           of helping verb that will be explained later in this chapter.

           The following explanation of these helping verbs will make it
           easier to sort out how they do their jobs.

                    Helping verbs help the main verb to make
                a statement, ask a question, or give a command.

           Verbs are complex; we include here the essential information
           for understanding verbs and how to use them. You will find the
           following short definition of verbs helpful.


                   A verb is a word that tells what the subject
                    of a sentence does, experiences, or owns.

           The next section will cover the two main verb groups that you
           need to understand before we explain the principal parts of verbs.


           4.4  Regular and Irregular Verbs

           Verbs change in form. Based on how they change, verbs are
           divided into two groups.

           One group of verbs uses a predictable pattern in changing form.











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