lay
verbto put something down carefully in a place
Lay + a thing: lay the table, lay an egg.
Ask: is anything being put down? If yes, use lay. If you are the one resting, use lie. (Confusingly, lay is also the past of lie: “Yesterday I lay down.”)
Quick answer
In the present tense, lay takes an object: you lay something down. Lie has no object: you lie down yourself.

to put something down carefully in a place
Lay + a thing: lay the table, lay an egg.
to rest flat, or to be in a position, without an object
Lie alone: you lie down yourself.
| Word | Type | Means | Example | Common mistake |
|---|---|---|---|---|
| lay | verb | to put something down carefully in a place | Please lay the documents on my desk. | |
| lie | verb | to rest flat, or to be in a position, without an object | I need to lie down for ten minutes. |
verb
Examples
Please lay the documents on my desk.
Hens lay eggs almost every day.
Common mistake
Not: She lied the baby in the cot.
Say: She laid the baby in the cot.
Lay needs an object (the baby). Its past form is laid.
verb
Examples
I need to lie down for ten minutes.
I like to lie in bed and read on Sundays.
Common mistake
Not: I'm going to lay down for a while.
Say: I'm going to lie down for a while.
Nobody is putting anything down, so use lie.
Read the sentence, then choose the word that fits.
Write or say two sentences, one with each word, in a real conversation.