Nouns, pronouns, or groups of words that are used as nouns or pronouns, are called by the general term, Substantives.
3. Adjective; a word used to limit or qualify the meaning of a noun or a pronoun; as, good, five, tall, many.
The words a, an, and the are words used to modify nouns or pronouns. They are adjectives, but are usually called Articles.
4. Verb; a word used to state something about some person or thing; as, do, see, think, make.
5. Adverb; a word used to modify the meaning of a verb, an adjective, or another adverb; as, very, slowly, clearly, often.
6. Preposition; a word used to join a substantive, as a modifier, to some other preceding word, and to show the relation of the substantive to that word; as, by, in, between, beyond.
7. Conjunction; a word used to connect words, phrases, clauses, and sentences; as, and, but, if, although, or.
8. Interjection; a word used to express surprise or emotion; as, Oh! Alas! Hurrah! Bah!
Sometimes a word adds nothing to the meaning of the sentence, but helps to fill out its form or sound, and serves as a device to alter its natural order. Such a word is called an Expletive. In the following sentence there is an expletive: There are no such books in print.
4. A sentence is made up of distinct parts or elements. The essential or Principal Elements are the Subject and the Predicate.