Past Perfect Continuous Tense

Identification: when the work is not going on but began in the past and there is indication of time. The time of the sentence is past.

1. I had been doing this work for 2 hours.
2. My friends had been coming to my house for weeks.

Helping verbs used: had been

Affirmative: use of had been

1. I had been doing my work for many years.

Negative: use of had not been

1. I had not been doing my work since my injury, but now I am doing it.

Interrogative: use of had at the beginning of the sentence

Had you been going to school before you came here?

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