Past Perfect Continuous Active
| Залог : Active --- Passive | had + been + 4ф(ing) |
| Tenses | 1. Indefinite - 2. Continuous - 3. Perfect - 4. Perfect Continuous |
| 1. Present
2. Past 3. Future |
Длительное действие совершавшееся или закончившееся перед другим действием в прошлом.
I had been writing the letter for an hour when he came. |
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