What Is the Past Perfect?
The past perfect describes an action that happened before another action or time in the past. It helps us show which of two past events came first.
Subject + had + past participle
She had already left when I arrived.
By the time the film started, we had found our seats.
Past Perfect vs Simple Past
When two things happened in the past, use the past perfect for the earlier event and the simple past for the later one.
When I arrived, she had already gone home.
→ She left first. Then I arrived.
He had never seen snow before he moved to Canada.
→ He moved to Canada. Before that, no snow.
They had finished dinner by the time the guests arrived.
→ Dinner was finished first. Guests arrived second.
Positive, Negative and Question Forms
Positive: She had finished the report before lunch.
Negative: He hadn't met her before the party.
Question: Had you visited the city before?
Short answer: Yes, I had. / No, I hadn't.
Common Time Expressions
By the time we got there, the show had already started.
After she had read the instructions, she assembled the furniture.
I realized I had forgotten my keys.
He had never tried sushi before that evening.
⚠ Common mistakes:
✗ When I arrived, she already left. → ✓ When I arrived, she had already left.
✗ He had went to bed before midnight. → ✓ He had gone to bed before midnight. (use past participle, not simple past)
✗ By the time she called, I had fell asleep. → ✓ I had fallen asleep.