As language users, we sometimes get into difficulty when we must follow prescribed language rules. This usually occurs in writing. Spoken language is much more informal than writing and less constrained. In the nineteenth century, formal grammar guides were written, often prescribing rules used by the upper classes. As a result, today we are saddled with the distinction in formal writing between who
, the incorrectness of using since
to mean because
, the inadmissibility of the split infinitive, and the not ending a sentence with a preposition
rule. Regarding the latter, Winston Churchill quipped, "That is the type of arrant pedantry up with which I shall not put."