Lay Lie

She lays it down, laid it down, has laid it down, is laying it down. (The verb to lay takes an object; to lie doesn't.)

She lies down, lay down, has lain down, is lying down

LIE first person third person:

present I lie in bed she lies in bed

past I lay in bed she lay in bed

perfect form I have lain in bed she has lain in bed

participle form I am lying in bed she is lying in bed

LAY first person third person

present I lay it down she lays it down

past I laid it down she laid it down

perfect form I have laid it down she has laid it down

participle form I am laying it down she is laying it down