The verb 'to lay' (as with the verb 'to put' or 'to place') needs an object to lay. The verb 'to lie' (as with 'to sit or 'to stand') does not.
Harry lies on the bed
Harry lay on the bed yesterday
Harry has lain on the bed
Harry is no longer lying on the bed.
Harry lays Draco on the bed
Harry laid Draco on the bed yesterday
Harry has laid Draco the bed
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