This tense express an action that started in past and continued to present or recently stopped. It is used to state an ongoing action that has started at a point in the past. A time-reference is also used in the sentence to show that when the action started in past or for how long the action continued.
The specific words 'since' and 'for' are used in sentence to show the time of action. The word 'since' is used if the exact starting time of action is known or intended to be reflected in the sentence. The word 'for' is used to express the amount of time for which the action was continued.
Structure of Sentence.
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