Check out Unnecessary Corrections by rogersgeorge. Here is an excerpt:
The young lady is not usually an example of good things in the Luann comic, but she illustrates a good point here.
You have permission to end a sentence with a “preposition”!
Actually it’s an adverb, or part of a separable verb, if you prefer. Use the search box on the upper right corner…
The full article is available here.