Words are divided into parts of speech according to:

Words are divided into parts of speech based on the function they perform in a sentence, which is the work they do. The way a word functions in a sentence helps determine its part of speech. For example: ·         Nouns name people, places, things, or ideas. ·         Verbs express actions or states of being. ·         Adjectives describe or modify nouns or pronouns. ·         Adverbs modify verbs, adjectives, or other adverbs. ·         Pronouns take the place of nouns in a sentence. ·         Prepositions show the relationship between a noun or pronoun and other words in a sentence. ·         Conjunctions connect words, phrases, or clauses.