Lay means “to put or place something,” so it always needs an object: you lay a book on the table. Lie means “to recline or rest,” and it never takes an object: you lie on the couch. If you can ask “lay what?” and get an answer, use lay.
- Please lay the blanket on the bed. (The blanket is being placed.)
- I’m going to lie down for an hour. (Nobody is placing anything.)
The confusing part is the past tense: the past of lie is lay. This GrammarVista.com USA guide gives you the full conjugation chart, the trap explained step by step, and practice sentences to lock it in.
Key Takeaways
- Lay = place; it needs an object (lay, laid, laid, laying).
- Lie = recline; it takes no object (lie, lay, lain, lying).
- “Yesterday I lay down” is correct, because lay is the past tense of lie.
- Lie meaning “tell an untruth” is regular: lied, lied.
Transitive vs. Intransitive: The Key Difference
A transitive verb carries its action over to an object. Lay is transitive: She lays the keys on the counter.
An intransitive verb doesn’t take an object. Lie is intransitive: The keys lie on the counter. Towson University’s guide to lay vs. lie uses the same object test.
| Verb | Type | Meaning | Needs an object? | Example |
|---|---|---|---|---|
| lay | transitive | to put, to place | Yes | Lay the baby in the crib. |
| lie | intransitive | to recline, to be located | No | The baby lies in the crib. |
Objects and places can lie too: The town lies at the foot of the mountains.
Quick rule: Lay = place (it needs a thing). Lie = recline (it stands alone).
The Full Conjugation Chart
Here are all the forms side by side, including a third verb, lie meaning “to tell an untruth,” which is regular and easy. The Purdue OWL’s commonly confused verbs page lists the same principal parts.
| Verb | Present | Past | Past participle | -ing form |
|---|---|---|---|---|
| lie (recline) | lie / lies | lay | lain | lying |
| lay (place) | lay / lays | laid | laid | laying |
| lie (tell an untruth) | lie / lies | lied | lied | lying |
Examples for each form
- Lie (recline): Today I lie in the sun. Yesterday I lay in the sun. I have lain in the sun all afternoon. I am lying in the sun.
- Lay (place): Today I lay the towels out. Yesterday I laid them out. I have laid them out. I am laying them out.
- Lie (untruth): He lies about his age. He lied to the officer. He has lied before. She knew he was lying.
The Past-Tense Trap: “I Lay Down Yesterday”
Because the past tense of lie is lay, these two sentences are both correct, and they mean different things:
- Today I lay the book on the desk. (present tense of lay: placing the book)
- Yesterday I lay on the couch. (past tense of lie: reclining)
So when you rested at some point in the past, the correct form is lay, not laid.
| Avoid | Use | Why |
|---|---|---|
| I laid down after lunch. | I lay down after lunch. | Past of lie (recline) is lay. |
| The dog laid in the shade all day. | The dog lay in the shade all day. | The dog wasn’t placing anything. |
| I’m going to lay down. | I’m going to lie down. | No object; present of lie. |
| He was laying on the floor. | He was lying on the floor. | -ing form of lie is lying. |
| She has laid there for hours. | She has lain there for hours. | Past participle of lie is lain. |
| I lied the papers on the desk. | I laid the papers on the desk. | Placing papers = lay, past laid. |
In casual American speech, you’ll hear “lay down” for “lie down” all the time. Merriam-Webster notes that intransitive lay is common in speech but generally considered nonstandard in edited writing.
A quick check for the past tense
- Is something being placed? If yes, use lay / laid / laid.
- If not, when did it happen? Now = lie. Past = lay. With has/have/had = lain.
Our guide to American-English grammar rules covers other verbs that trip people up.
Idioms: Lie Low, Lay Low, and Friends
Lie low vs. lay low
To lie low means to stay out of sight for a while. Because no object is involved, lie low is the traditional form and the safer choice in formal writing: After the scandal, the senator decided to lie low.
Lay low is very common in American speech, and dictionaries record it as a widely used variant. If you want the version no editor will question, use lie low (past tense: lay low).
Other expressions
- Lay off (to dismiss workers): The company laid off 50 employees.
- Lay out (to arrange or explain): She laid out the plan.
- Let sleeping dogs lie: leave a situation alone (not “let sleeping dogs lay”).
- Lay an egg: hens lay eggs, so “the hen laid an egg” is correct.
Americans say lay of the land, while British speakers often say lie of the land. See our guide to American vs. British English differences for more contrasts like this.
Memory Tricks
Quick rule: L-A-Y has an A, like “place.” You lay a thing down. L-I-E has an I, like “I recline.”
- People lie; people lay things. If you could swap in place or put, use lay. If recline fits, use lie.
- Past of lie is lay; past of lay is laid.
Practice: Lay or Lie?
Test yourself with these GrammarVista.com USA practice sentences. Choose the correct form of lay, lie (recline), or lie (tell an untruth).
- Every afternoon, my grandfather ______ down for a nap.
- Could you ______ the map on the table so we can all see it?
- Last night I ______ awake until two in the morning.
- The documents have ______ in that drawer for years.
- The witness admitted she had ______ about where she was.
Answer key
- lies (reclining, present tense)
- lay (placing the map)
- lay (reclining, past tense of lie)
- lain (past participle of lie)
- lied (told an untruth)
Number 3 is the one most people miss. More verb lessons live in our grammar rules section.
The Bottom Line
Lay means place and needs an object. Lie means recline and takes none. The trap is that lay is also the past tense of lie, so “Yesterday I lay down” is correct.
Ready for the next pair? Browse our list of commonly confused words, starting with affect vs. effect, or revisit who vs. whom. The whole collection is in our tricky words section.
Keep the chart handy, and this pair stops being scary. You’ll find more charts like it on GrammarVista.com USA.
Frequently Asked Questions
Is it “lay down” or “lie down”?
For resting in the present or future, use “lie down”: “I need to lie down.” Lay needs an object, so you lay something down, such as a book or a baby. In the past tense, though, “I lay down” is correct, because lay is the past tense of lie. Casual speech often blurs this distinction.
What is the past tense of lie?
It depends on the meaning. For lie meaning recline, the past tense is lay and the past participle is lain: “I lay down,” “I have lain here.” For lie meaning tell an untruth, both forms are lied: “She lied,” “She has lied.” Laid belongs only to lay, meaning to put or place.
Is it “lie low” or “lay low”?
“Lie low” is the traditional form, because staying out of sight involves no object. It is the safest choice in formal writing. “Lay low” is very common in American speech and informal writing, and dictionaries record it as a widely used variant. The past tense of lie low is lay low.
Is “I laid in bed all day” correct?
Not in standard written English. You were not placing anything, so the verb is lie, and its past tense is lay: “I lay in bed all day.” “I laid in bed” is common in casual speech, but editors and teachers will usually mark it as an error in formal writing, school papers, and published work.