I lay down my backpack in the hallway when I get home.
Present
Present Participle
Past
Past Participle
Lie (self)
lie
lying
lay
lain
Lay (object)
lay
laying
laid
laid
Notice that the transitive verb (the one you do to an object) is more regular than the intransitive verb (the one you do to yourself). Lay adds -ing and -ed (with a spelling change). Lie adds -ing, but changes to lay and lain.
I lie down on my bed when I am tired.
I am lying down on my bed right now.
I lay down on my bed yesterday.
In the past I have lain down on my bed.
I lay my backpack down in the hall.
I am laying my backpack down.
Yesterday I laid my backpack down.
In the past I have laid my back pack down.
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