ex: He went into the room, and laid down on his bed.

If you are using “lay” to mean “have sex with” or to mean putting something else (generally not oneself, except in the special case of the poem line “now I lay me down to sleep”) down, to laying in wait, or certain other meanings, then laid is the past tense.

Hope this is of some help.

He went into the room and lied down on his bed.

Laid = Placing an object somewhere

Lay = Placing an object again.

Lied = Human placing his or herself on something.

Past : He went in and laid down on his bed.

activities.macmillanmh.com/reading/treasures/html/56_Troublesome_word_pairs.pdf –

Lie means to lie down. (I want to lie down on the couch.) The past tense of lie is lay.

Lay means to lay something down. (Please lay the eggs on the table gently.) The past tense of lay is laid.

There’s more about it on this website… http://web.ku.edu/~edit/lie.html

Therefore, the answer to your question is: The corecct way to say it is “He went into the room and lay down on his bed.”

Hope i could help!

Come lie down by me.

Get a dictionary/thesaurus.

thats the one that sounds most right…