Past perfect progressive

From Teflpedia

The past perfect progressive or past perfect continuous is an English aspectual tense combining the past tense with the perfect aspect using auxiliary have and the progressive aspect using auxiliary be and the present participle. For example, "I had been doing something".

Speakers don't typically use this in the passive voice. e.g. "The builders had been building the church" would typically not be passivised to ?"The church had been being built". Speakers are more likely to use just the past perfect with circumlocution instead, e.g. ?"The church had been under construction". The present perfect progressive is similar in this regard.

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