[caption id="attachment_2128" align="alignright" width="300"] The phrase "to boldly go where no man has gone before," popularized by Star Trek, includes a split infinitive--but the grounding for this prohibition is shakier than you may think.[/caption]
You have heard the rules before: Don't end a sentence with a preposition. Don't split an infinitive. Don't start with a conjunction. But who makes these rules? How did they become incorporated into English grammar?
One culprit is Robert Lowth, who advised against ending English sentences with prepositions based on an earlier Latin rule. Similarly, according to Smithsonian Magazine, Henry Alford popularized the prohibition against splitting infinitive's in A Plea for the Queen's English.
In Latin, sentences don’t end in prepositions, and an infinitive is one word that can’t be divided. But in a Germanic language like English, as linguists have pointed out, it’s perfectly normal to end a sentence with a preposition and has been since Anglo-Saxon times. And in English, an infinitive is also one word. The “to” is merely a prepositional marker. That’s why it’s so natural to let English adverbs fall where they may, sometimes between “to” and a verb.
We can’t blame Latinists, however, for the false prohibition against beginning a sentence with a conjunction, since the Romans did it too (Et tu, Brute?). The linguist Arnold Zwicky has speculated that well-meaning English teachers may have come up with this one to break students of incessantly starting every sentence with “and.” The truth is that conjunctions are legitimately used to join words, phrases, clauses, sentences—and even paragraphs.
This is a case where a little learning is a dangerous thing. Because the rules are easy to remember, snobs can readily point them out in writing or speech. There is also a desire for social acceptability: no one wants to look stupid, even if the reasons for the rule make no sense. Writers trying to stick to the letter of the law often contort their sentences, while the better practice is often simply to say what sounds natural.
Micro-institutions can seem so ingrained that we fail to question them. Just going with the flow can sometimes make sense, but looking a little deeper can help to expose senseless rules or useless norms. The key is to understand which rules fall into which category. I do not have an answer now. But it's something I would like to know more about.