The past perfect tense describes an action that was completed before another action in the past. It's formed using "had" + the past participle of the verb. Here's a breakdown:
* Structure: had + past participle (e.g., had gone, had eaten, had written)
* Use: To show an action that happened before another past action.
* Example: "I had eaten breakfast before I left for work." (Eating breakfast happened before leaving for work.)
Let me know if you have any further questions about the past perfect tense or any other grammatical concept!