| Signal words | Use | Form | Examples | Examples | Examples |
| how long | how long something had been happening before something else happened | had + been + infinitive + ing | I had been working. | I hadn't been working. | Had I been working? |
| He had been working. | He hadn't been working. | Had he been working? | |||
| I had been going. | I hadn't been going. | Had I been going? | |||
| He had been going. | He hadn't been going. | Had he been going? |
Monday, October 1, 2007
Past Perfect Progressive or Past Perfect Continuous
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