现在完成进行式 vs 过去完成进行式【英语语法】

What’s the difference between “I have been working” and “I had been working”? In this English class, we will compare the PRESENT PERFECT CONTINUOUS tense and the PAST PERFECT CONTINUOUS tense. After watching, you won’t be confused ever again on when you should use each of these tenses. We’ll review when to use each tense, how to form them, and what common mistakes to avoid.