'Lay' is transitive (to place something); 'lie' is intransitive (to recline, no direct object needed).
"Lay" needs an object: you place something somewhere. There is always something you are putting down. "Lay the book on the table": the book is the object.
Please lay the documents on my desk before the three o'clock meeting.
She laid the baby gently in the crib and tiptoed out of the room.
The workers laid the foundations of the new building last March.
"Lie" does not need an object: the subject reclines or rests on its own. Nobody places anyone; you lie down yourself. The past tense is "lay", which causes a lot of confusion.
He was so exhausted that he just needed to lie down for an hour after work.
The cat lay in the sun all afternoon without moving a single time.
After the surgery, she had to lie still in bed for three days to allow proper healing.
Common mistake
Trick to remember it
Quick rule
Did you know?
The lay/lie confusion is so widespread it even appears in the title of a famous song. "Lay, Lady, Lay" by Bob Dylan (1969) is grammatically incorrect, it should be "Lie, Lady, Lie" (recline, lady, recline), since there is no direct object. Dylan said he chose "lay" for sonic and rhythmic reasons. Some linguists argue the song accelerated the erosion of the distinction in popular American English. In contemporary informal English, "lay down" (to recline) is so widespread that many consider it acceptable, but in formal and academic English, the distinction remains obligatory.
Exercise 1 · Pick the right one
She _____ down on the sofa and fell asleep within minutes.
Exercise 2 · Pick the right one
Please _____ the book on the table when you have finished with it.
Exercise 3 · Form the word
One means to receive or agree to something, the other means to exclude or not include.
'Advice' is the guidance you receive (noun); 'advise' is the act of giving that guidance (verb).
'Affect' is the verb meaning to influence something; 'effect' is the noun meaning result or consequence.
'Aisle' is the walkway between rows of seats or shelves; 'isle' is a small island.
Bryan López
Founder of SpeakUP Academy