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Oxford Online English
How to Use the Past Perfect Tense in English - English Grammar Lesson
In this lesson, you can learn about the past perfect verb form.
What does the past perfect mean? When do you need to use the past perfect? How do you use the past perfect verb tense correctly in a conversation?...
What does the past perfect mean? When do you need to use the past perfect? How do you use the past perfect verb tense correctly in a conversation?...
Khan Academy
Khan Academy: Perfect Aspect
You use the perfect verb aspect to express when an action is completed, like 'I have done the dishes.'