PAST PERFECT PROGRESSIVE TENSE
The PAST PERFECT PROGRESSIVE TENSE indicates a continuous action that was completed at some point in the past. This tense is formed with the modal "HAD" plus "BEEN," plus the present participle of the verb (with an -ing ending): "I had been working in the garden all morning. George had been painting his house for weeks, but he finally gave up."
He
had been teaching English
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