noun
a word that represents a person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
article
a word that is used to specify the definiteness of a noun
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The book has been sitting on the shelf for months without being touched.
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I found that old CD on the shelf in the living room.
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I scored a sick pair of kicks on the shelf at the thrift store.
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His dreams of becoming a professional athlete were left on the shelf when he decided to pursue a different career path.