213. Adverbs, Prepositions, Conjunctions, and Interjections are called Particles. In their origin adverbs, prepositions, and conjunctions are either (1) case forms , actual or extinct, or (2) compounds and phrases. Particles cannot always be distinctly classified, for many adverbs are used also as prepositions and many as conjunctions (§ 219 and § 222).
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