We use the present perfect continuous in two ways:
1. to talk about an event which started in the past and is continuing now. We often use the words for and since with this tense.
2. to talk about an event which lasted for some time and recently finished; the effects of this event are still apparent.
Form
We make the present perfect continuous by using the present perfect of the verb to have (have/has been) and the present participle of the main verb.
Present Perfect: Simple or Continuous?
Both tenses are used to describe an action which finished a short while ago.
The simple tense tells us the action is completed and its result still has an effect.
The continuous tense put the emphasis on the duration of the action, indicating that it went on for some time.
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