What Is The Present Perfect Continuous Tense Formula
With both past perfect continuous tense and present perfect continuous tense the action must have started sometime in the past. Present Perfect Tense Sentences 50 Examples of Affirmative Negative Interrogative Sentences.
The action could have started years in the past or have started a few minutes in the past.

What is the present perfect continuous tense formula. The present perfect tense is used to express a past event that has happened at an unspecified time where the exact time is not known and also is not necessarily completed. In neither case is there any time limit when this could have been.
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