The four major parts of speech are: noun, verb, adjective, and adverb; the minor parts of speech vary according to schools of grammatical theory, but include: conjunction, preposition, pronoun, and interjection.
In languages like Greek and Latin, the part of speech of a word tends to be invariable (usually marked by an ending, or inflection); in English, it is much harder to recognize the function of a word simply by its form.
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