Choose the grammatically correct sentence:

The correct answer is Option (1) → The old letters had lain untouched in Nani’s steel trunk for forty years before we found them.

“Lie” (rest) and “lay” (put down):

• Lie means to rest or stay in a place. It has no object. Its forms are lie, lay, lain.
• Lay means to put something down. It needs an object. Its forms are lay, laid, laid.
• The letters stayed in the trunk, and there is no object. After “had”, we need the past participle (V3), and the V3 of “lie” is “lain”. So “had lain” is correct.

Why the Other Options are Incorrect?

Option 2: The old letters had laid untouched in Nani’s steel trunk for forty years before we found them. — Incorrect. “Laid” is the V3 of “lay” (put down), which needs an object. Nothing is put down here.

Option 3: The old letters had lied untouched in Nani’s steel trunk for forty years before we found them. — Incorrect. “Lied” comes from the other “lie”, which means to say something untrue.

Option 4: The old letters had layed untouched in Nani’s steel trunk for forty years before we found them. — Incorrect. “Layed” is a wrong spelling of “laid”.