Past perfect continuous
I had been saving money for two years.
The continuous tenses emphasize the ongoing nature of the activity. Think of them as a variation of the standard perfect tenses. Here are the four perfect tenses:
present perfect: I have lived in Madrid for two years.
present perfect continuous: I have been living in Madrid for two years. => emphasizes the ongoing nature of the activity
past perfect: I had lived in Madrid for two years.
past perfect continuous: I had been living in Madrid for two years. => emphasizes the ongoing nature of the activity
In practice, the difference between the standard and continuous forms is subtle. Both are correct in most situations. Don't worry too much about which one to use.
Progress, Vol. 4
Progress, all volumes
Active recall
Rereading feels productive but fades fast. What actually works is closing the page and trying to recall what you just learned. The effort of reconstructing knowledge from memory is what makes it stick.
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