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AGREEMENT BETWEEN HELPING VERB AND FORMS OF VERB|with examples

Following is the description of helping verb and the forms of verb: 
  • The Present Form of Verb: (1stform + s / es)
         With the following words, we use the 1st form of verb (s / es):
         do, does, did, shall, will, can, could, would, should, may might, must, used to, ought to, is to, am to, are to, was to, were to, has to, have to, had to, shall have to, will have to, often, always, usually, daily, when, before.
  • The Past Form of Verb: (the 2nd form of verb or did + 1stform)
           Following are the markers for the use of the past simple tense:
           Ago, last, yesterday, when, before, just.
  • The Past Participle: (the 3rdform of verb)
           Following are the markers for the use of the 3rd form of verb:
           Has, have, had, almost, already, just, passive voice.
  • The Present Participle: (the ing form of verb)
          Following are the markers for the use of the ing form of verb:
          Is, am, are, was, were, shall be, will be, since, for, now, at present.
Examples:
(i)      It rains/is raining now.
(ii)     His father had died/died three years ago.
(iii)   The patient had died when the doctor came/had come. 

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