Grammar

Let me first point out that there is no such rule prohibiting ending a sentence with a preposition.  Anyone who asks, “For what are you looking?” as opposed to “What are you looking for?” is a fool.

Now, to the matter at hand, when I was a little boy, my mom corrected me on the verbs “lie” and “lay,” which are easily confused, perhaps because the past tense of “lie” and the present tense of “lay” are the same word (“lay”).

Lie – intransitive verb (doesn’t take an object) To recline

Present: Lie – I lie down on the sofa.  Please lie down here.  The dog lies on its bed.  Don’t bother me; I’m lying down.

Simple past: Lay – Yesterday, I lay down on the sofa.

Present perfect and past perfect: lain – I have lain on the sofa many times.

Gerund: Lying — Lying in the sun feels good.

Lay – (transitive verb, takes an object) To put an object somewhere

Present: Lay – I lay the book on the table.

Simple past: Laid – Yesterday, I laid the book on the table.

Present perfect and past perfect:: Laid.  I have laid books on that table many times.

Gerund: Laying — Laying down a winning poker hand and raking in the pot feels good.