The misnamed "split infinitive" construction, where a modifier is placed immediately before the verb of an infinitival complement, has never been ungrammatical at any stage in the history of English, and no confident writer of English prose has any problems with it at all. (As the grammarian George O. Curme pointed out in 1930, it's actually the minor writers and nervous nellies, the easily intimidated, who seem to worry about it.) Quite often, placing a modifier just after to and just before the verb is exactly the right thing to do with a modifier in an infinitival complement clause (see the discussion on this page). However, that is not the same thing as saying it is always the right thing to do. Sometimes it's an absolute disaster. My colleague Bob Ladd was preparing to fly back to Edinburgh (EDI) from Munich in Germany when his airline, easyJet, sent him the following email (bafflingly, they sent it after he was in the departure lounge):
Dear DWIGHT ROBERT LADD
We are really sorry to inform you that your easyJet flight, 6914 to EDI on 24/09/2010 has been cancelled. We understand that cancelling your flight will cause you inconvenience and we are very sorry when things don't run as scheduled.
We always aim to provide the best possible experience when flying with easyJet, however from time to time situations arise which are out of our control. On this occasion we've been forced to take the decision to regrettably cancel your flight.
You can see that this is by an inexperienced writer just from penultimate sentence, with its the dangling participle (who is flying?) and classic "comma-splice" run-on sentence and mispunctuated connective adjunct however. But the placement of the adverb regrettably is a much worse mistake. It is a horrible, disastrous writing choice, genuinely leading to syntactic ill-formedness. But why, exactly?
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