Hi, Anon, In my humble opinion, there's something wrong with your excerpt. " What the word "prep" is doing there I'd need to look at your source to figure out. One method I often use to check for conjunctions is substituting "and" for the phrase or word in question.
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Anonymous I'm confused with the use of FORIn the currently popular, "Forgive them, for they know not what they do," it's a conjunction, connecting two independent clauses.
I know it can be a prep or a conjunction... but I don't know what the difference is