what is the difference between progressive and perfect progressive 
 

The differences between the progressive tense and perfect progressive tense are as follows:

  • The progressive tense indicates an action that is, was, or will be occurring in certain time. While, the perfect progressive tense indicates actions that occur repeatedly over a period of time in past, are continuing and/or will occur in future.
  • In progressive tense, verbs are formed with verb "be"+ -ing. Whereas, perfect progressive tense is formed by using have/has/ had/will have+been+ -ing.

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