Past perfect simple or past perfect continuous? I had worked or I had been working

In this lesson, learn the difference between the past perfect simple and the past perfect continuous. What is the difference between I had worked and I had been working? Learn the three different reasons for using the correct form. Improve your accuracy in using the English tenses to impress and improve.

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Видео Past perfect simple or past perfect continuous? I had worked or I had been working канала Oxford English Now