as

One of the most useful and most overworked words in the language, as is a proper conjunction and adverb essential to good idiomatic English. As a conjunction, however, as is usually weaker (less effective) than since, because, and when, each of which is more exact: "Since (preferably not as) it was snowing, we stayed indoors." As is often used for a more specific that or whether: "I don't say that (not as) he was right." "I doubt whether (not as) he was correct." As is incorrectly used for who in a sentence such as "Those as have no tickets are out of luck" and for whom or that in "The car hit the man as I had just spoken to."