Grammar rant, one each, $.02

[semperfiona]

Remember that old canard about not ending sentences with prepositions?
You know the one, the so-called rule that Winston Churchill memorably
dissed? Well, it really is a rule. No preposition may exist without an
object thereof. It's such a strong rule that I almost can't formulate a
*-sentence (linguists use asterisks to indicate impossible or
ungrammatical constructions) that demonstrates this. But here goes:
*Come into.

There are two different things going on in cases where it looks like
someone has ended a sentence with a preposition. One is that English is
rife with idiomatic phrasal verbs, and the other is that most of the
words we call prepositions may also be used adverbially. Let's look at
some examples.

I put up with nonsense. This is a very simple subject-verb-object
sentence; its only curious feature is that the verb is a three-word
phrase. Put does not mean the same thing as put up, and
they both differ from put up with.

Come in! This is an imperative verb, come, plus the
adverbial in. If you wanted a prepositional phrase here, it would
have to be Come into the house.