Commonly Confused Words: Lie vs. Lay

I am of the opinion that the distinction between lie and lay is fast becoming obsolete. I haven’t checked, but I am guessing that lay as a present tense, intransitive verb is already listed in dictionaries. When more people use a word “incorrectly” than use it “correctly” (e.g., I think I’ll lay down for a nap) over many years, they eventually cease being incorrect because common usage wins out and becomes formally accepted.

Do you know anyone who commands his dog to lie down?

This kind of thing still matters to many people though; so, I recommend at least understanding the traditional distinction between lie and lay.