It depends on the context, because lay is a transitive verb, referring to a direct object, while lie is an intransitive verb, referring to the subject.
Lay means "to put or place something or someone down," e.g. "I need to lay Mark down in his bed, before I drop him."
Lie, on the other hand, means "to relax or recline," e.g. "Mark needs to lie down in bed before he falls asleep, because I can't carry him."
Lie Down
lie down.
lie
Lay is a transitive verb and needs an object - lay (something) down or lay down (something) Lie is intransitive and doesn't need an object - i lie on the floor The confusion arises from the fact that "lay" is also the past tense of "lie" In the present "I lie in my bed" In the past "I lay in my bed" I would recommend "Lie down and go to sleep.". But now I lay me down to sleep. Because the object is me (though it should be myself).
lay down
They LIE down (to lie, lay, lain). LAY the table, please! (to lay, laid, laid).
Lie Down
lie down.
lie
Lay is a transitive verb and needs an object - lay (something) down or lay down (something) Lie is intransitive and doesn't need an object - i lie on the floor The confusion arises from the fact that "lay" is also the past tense of "lie" In the present "I lie in my bed" In the past "I lay in my bed" I would recommend "Lie down and go to sleep.". But now I lay me down to sleep. Because the object is me (though it should be myself).
That is the correct spelling of "laid down" (verb to lay, transitive verb).The past tense of lie (lie down) would be lay down(verb to lie, intransitive verb).
lay down
This is an idiomatic phrase, and the correct verb is "lie" (which you do) rather than lay (which you do to something else)."You really need to lie down" means "You should lie down."
laid down Neither - it's lay, the past tense of to lie.
Lie down and go to sleep (issued as a command) He lay down and went to sleep ( description of what he did) I am going to lie down and go to sleep ( statement of my intent)
It's "I'm lying down." You lie down, you lay something on the table. Lay means to place something down; in other words, it's something you do to something else (as in to lay the blanket on the couch). Lie means to recline or be placed; it is an intransitive verb, because it does not act upon anything or anyone else. See related links for more information.
The answer involves the difference between the verbs lieand lay. Lie is the correct verb to describe putting yourself in a horizontal position, as in "lie down". Lay is a transitive verb (used with an object) and is used for placing or positioning something, as in "lay a book on the table".The present, past, and past participle forms of "lie" are lie, lay, and lain. The present, past, and past participle forms of "lay" are lay, laid, and laid. If the question is about lying down (to rest or to sleep), the correct form is "I lay down." It is worth mentioning that incorrect usage of lay instead of lie (as in "I laid down") is very common.