Lay vs lie: the rule in one line, every form in one table, and the past-tense trap
"Lay" means to put something down, and it always needs an object: lay the book on the desk. "Lie" means to recline, and it never takes one: lie on the couch. The trouble is the past tense, where "lay" shows up again. Here is every form in one table, the trap, and a test you can use while editing.
The rule
- Lay = to put or place something. It needs an object: you lay something. "Lay the manuscript on my desk."
- Lie = to recline or rest. No object: you just lie. "I need to lie down." "The answer lies in chapter 3."
(The other "lie," to tell an untruth, is regular: lie, lied, lied. It is not part of the confusion.)
Every form
| Verb | Present | Past | Past participle | -ing form |
|---|---|---|---|---|
| Lay (put) | I lay the book down | I laid it down | I have laid it down | I am laying it down |
| Lie (recline) | I lie down | I lay down | I have lain down | I am lying down |
Standard English forms. The Chicago Manual of Style covers the pair in its glossary of problematic words and phrases, section 5.254 of the 18th edition.
The past-tense trap
"Lay" is both the present tense of lay and the past tense of lie. That is why both of these are correct:
- Every afternoon I lay my notes out on the table. (Present of lay: I put my notes.)
- Yesterday afternoon I lay on the couch for an hour. (Past of lie: I reclined.)
And why these, though common, are wrong in edited prose:
- "I'm going to lay down." → I'm going to lie down.
- "Yesterday I laid in bed all morning." → Yesterday I lay in bed all morning.
- "The papers had laid there for weeks." → The papers had lain there for weeks.
A test while editing
Swap in "put" or "place." If the sentence still works (put the book down), you want a form of lay. If it needs "recline" or "rest" instead (rest on the couch), you want a form of lie. Then pick the tense from the table.
In dialogue, keep people's words as they said them; plenty of people say "lay down," and a character can too. In narration, a copy editor will fix it. See what a copy editor does, and for other usage pairs, who vs whom and that vs which.
Start here: search your manuscript for "laid" and "laying." For each one, ask whether someone is putting something somewhere. If not, it should be a form of lie.
Common questions
What is the difference between lay and lie?
"Lay" means to put something down and always takes an object: lay the book on the table. "Lie" means to recline or rest and never takes an object: lie down on the couch.
Is it lay down or lie down?
For yourself, it is "lie down" in the present: "I need to lie down." "Lay down" is correct in the past tense of lie ("Yesterday I lay down at noon") or when you put something down ("Lay down your pen").
What is the past tense of lie?
"Lay." Today I lie down; yesterday I lay down; I have lain down. This overlap with the present tense of "lay" is what makes the pair confusing.
What is the past tense of lay?
"Laid." Today I lay the book down; yesterday I laid it down; I have laid it down.
Sources: standard English verb forms; The Chicago Manual of Style, 18th edition, section 5.254 (glossary of problematic words and phrases), as referenced by CMOS Shop Talk, Chicago Style Workout 35, read November 1, 2026. Examples, the test and guidance were written by Scribe Media. Published by Scribe Media.