Here's the formula:
had + past participle
Examples:
* Present Tense: I eat.
* Past Perfect Tense: I had eaten.
* Present Tense: He writes.
* Past Perfect Tense: He had written.
* Present Tense: They jump.
* Past Perfect Tense: They had jumped.
Key points to remember about the past perfect:
* It describes an action that was completed before another action or time in the past.
* It often uses conjunctions like "before," "after," "when," or "by the time" to indicate the sequence of events.
* The past participle can be regular (e.g., "walked," "played") or irregular (e.g., "gone," "seen").
Examples in sentences:
* Before she went to the store, she had already finished her homework. (The action of finishing homework happened before the action of going to the store.)
* By the time the train arrived, I had been waiting for an hour. (The action of waiting happened before the action of the train arriving.)
* He had never seen a movie like that before. (The action of seeing the movie happened for the first time.)
Let me know if you have any other questions about the past perfect tense!