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
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Guide to Grammar and Writing
