All English words are classified into eight classes. These eight classes are called eight parts of speech or word classes in English grammar. They are nouns, pronouns, adjectives, verbs, adverbs, prepositions, conjunctions and interjections. Some classify determiners as a separate part of speech thus listing nine parts of speech. Determiners are listed as adjectives in the classification of eight parts of speech. Words that belong to a particular part of speech are used in the same way. They have the same grammatical functions in sentences.