Tenses Questions
The present perfect continuous tense is used to describe an action that started in the past and is still ongoing in the present. It emphasizes the duration or repetition of the action. For example, "I have been studying for three hours."
On the other hand, the past perfect continuous tense is used to describe an action that started in the past and continued up until another point in the past. It emphasizes the duration or repetition of the action before a specific past event. For example, "She had been working for five years before she got promoted."
In summary, the present perfect continuous tense focuses on the ongoing action from the past until the present, while the past perfect continuous tense emphasizes the ongoing action from the past until a specific point in the past.