Which and that are used nearly interchangeably in everyday speech. Yet since which seems more formal, many people conclude it must be better in written material. Why is there so much confusion surrounding the use of these two words?
H.W. Fowler—the granddaddy of authoritative English style, usage, and grammar—explains a crucial part of the muddle in his 1926 classic, A Dictionary of Modern English Usage. Read more..
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