Form of Past Perfect
- P: He had spoken.
- N: He had not spoken.
- Q: Had he spoken?
Use of Past Perfect
Past Perfect Simple is used for actions taking place before a certain time in the past.
I had typed five pages when my computer suddenly crashed.
Before 2002, I had not worked abroad.
Signal Words of Past Perfect
already, just, never, not yet, once, until that day, If Clause Type III (If I had talked, …)