content words: main verbs (go, spoke, invented), nouns (scientists, radio), adjectives (interesting , clever), adverbs (quickly, properly), negative auxiliary verbs (can't, don't, aren't)), demonstratives (this, that, these), question words (who, which, where), function words: pronouns (I, you, she, they), prepositions (at, under, with), articles (a, the, some), conjunctions (and, but, so), auxilary verbs (can, should, must), verb be (is, am, was),

content words and function words

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