English usage is a subject as wide as the English language itself. By far
the greater part of usage, however, raises no controversies and poses no
problems for native speakers of English, just because it is their natural
idiom. But there are certain limited areas --particular sounds, spellings,
words, and constructions--about which there arises uncertainty,
difficulty, or disagreement. The proper aim of a usage guide is to resolve
these problems, rather than describe the whole of current usage....