Hi again, Lupa Certain word categories (such as prepositions, articles and conjunctions among others) are called "function" or "structure" words, as opposed to "content" words (nouns, lexical verbs, adjectives, adverbs). Some grammarians say that "function" words convey no meaning (on their own). They see these words as being different from nouns, adjectives, adverbs, in the sense that if you say, for example, "table", or "small", you can get a mental picture of the concept represented those words.
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