One always needs a direct object, the other never does.
Transitive verb. To put or place something on a surface. Always requires a direct object. Past tense: laid.
She laid the baby down gently.
Ella acostó al bebé con cuidado.
Lay the book on the table, please.
Pon el libro sobre la mesa, por favor.
He laid the foundations of the building.
Él puso los cimientos del edificio.
Intransitive verb. To recline or be in a horizontal position. Never takes a direct object. Past tense: lay.
I need to lie down. I have a headache.
Necesito acostarme. Tengo dolor de cabeza.
The cat is lying on the sofa.
El gato está tumbado en el sofá.
She lay on the beach for hours.
Ella estuvo tumbada en la playa durante horas.
Common mistake
The past tense of 'lie' (recline) is 'lay', which is also the present tense of 'lay' (to place). Wrong: "I laid down for a nap." (correct: I lay down for a nap.)
Trick to remember it
'Lay' = you have something in your hand that you are placing (needs object). 'Lie' = your own body goes horizontal (no object). Am I placing SOMETHING? Lay. Is my body reclining? Lie.
Quick rule
Is there a direct object (something you are placing)? Use 'lay'. No object, is your body reclining? Use 'lie'.
Did you know?
Even educated native speakers get lay/lie wrong. Bob Dylan wrote 'Lay Lady Lay' (should be 'Lie Lady Lie' grammatically). Eric Clapton wrote 'Lay Down Sally'. Both are grammatically incorrect. Both are iconic songs.
Exercise 1 · Pick the right one
Please _____ your coat on the chair.
Exercise 2 · Pick the right one
I feel sick. I need to _____ down.
Exercise 3 · Form the word
Is there a direct object (something you are placing)? Use 'lay'. No object, is your body reclining? Use 'lie'.
The past tense of 'lie' (recline) is 'lay', which is also the present tense of 'lay' (to place). Wrong: "I laid down for a nap." (correct: I lay down for a nap.)
'Lay' = you have something in your hand that you are placing (needs object). 'Lie' = your own body goes horizontal (no object). Am I placing SOMETHING? Lay. Is my body reclining? Lie.
Bryan López
Founder of SpeakUP Academy