The parts of speech are eight categories that describe how every word in English functions inside a sentence. Those categories are nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunctions, and interjections. Understanding them helps you see why words go where they do, how to fix awkward sentences, and how to write more clearly. A word’s part of speech isn’t permanently stamped on it. The same word can shift categories depending on how it’s used: “run” is a verb in “I run every morning” and a noun in “That was a great run.”
Nouns
A noun names a person, place, thing, or idea. Words like “teacher,” “airport,” “hammer,” and “freedom” are all nouns. They typically serve as the subject of a sentence (the thing doing something) or the object (the thing being acted on). In “The dog chased the ball,” both “dog” and “ball” are nouns.
Nouns break into a few useful sub-types. Common nouns refer to general items (“city,” “book”), while proper nouns name specific ones and get capitalized (“Chicago,” “Harry Potter”). Concrete nouns are things you can perceive with your senses (“smoke,” “table”), while abstract nouns refer to concepts (“justice,” “anxiety”). Collective nouns name groups: “team,” “flock,” “jury.”
Pronouns
A pronoun replaces a noun so you don’t have to repeat it. Instead of saying “Sarah said Sarah would bring Sarah’s car,” you say “Sarah said she would bring her car.” Common pronouns include “he,” “she,” “it,” “they,” “we,” “me,” “them,” and “you.”
Pronouns come in several varieties. Personal pronouns (“I,” “you,” “they”) stand in for specific people or things. Possessive pronouns (“mine,” “yours,” “theirs”) show ownership. Relative pronouns (“who,” “which,” “that”) connect clauses to nouns, as in “The book that I borrowed was excellent.” Reflexive pronouns (“myself,” “herself,” “themselves”) refer back to the subject, and demonstrative pronouns (“this,” “those”) point to specific items.
Verbs
A verb expresses an action or a state of being. Action verbs are straightforward: “write,” “jump,” “calculate.” Linking verbs connect the subject to a description rather than showing action. In “She is a doctor,” the verb “is” doesn’t describe something she’s doing; it links “she” to “doctor.” The most common linking verbs are forms of “be” (is, am, are, was, were), along with “seem,” “become,” and “appear.”
Verbs also split into transitive and intransitive. A transitive verb needs an object to make sense: “She threw the ball” works, but “She threw” feels incomplete. An intransitive verb stands on its own: “He slept” is a complete thought. Many verbs can be either, depending on the sentence. Helping verbs (also called auxiliary verbs) like “have,” “will,” and “can” pair with a main verb to express tense, possibility, or obligation: “She will arrive” or “They have finished.”
Adjectives
An adjective describes or modifies a noun. It answers questions like “which one?”, “what kind?”, or “how many?” In “three tall oak trees,” the words “three,” “tall,” and “oak” are all adjectives modifying “trees.”
Adjectives can appear right before the noun they modify (“a cold drink”) or after a linking verb (“the drink is cold”). Articles, the small words “a,” “an,” and “the,” are technically a special type of adjective because they modify the noun that follows. Possessive adjectives like “my,” “your,” and “their” also fit here, since they describe which noun you’re talking about.
Adverbs
An adverb modifies a verb, an adjective, or another adverb. It answers “how?”, “when?”, “where?”, or “to what degree?” In “She speaks clearly,” the adverb “clearly” tells you how she speaks. In “very tall,” the adverb “very” modifies the adjective “tall.”
Many adverbs end in “-ly” (“quickly,” “carefully,” “honestly”), but plenty of common ones don’t: “now,” “here,” “never,” “almost,” “always,” “too.” The word “not” is an adverb because it modifies the verb. Adverbs are flexible in where they can appear in a sentence, which sometimes makes them tricky to spot. “Yesterday she left,” “She left yesterday,” and “She yesterday left” all use “yesterday” as an adverb, though the last version sounds awkward.
Prepositions
A preposition shows the relationship between a noun (or pronoun) and another word in the sentence, usually indicating direction, location, time, or manner. Common prepositions include “in,” “on,” “at,” “by,” “with,” “under,” “between,” “through,” “during,” and “after.”
Prepositions almost always appear as part of a prepositional phrase, which includes the preposition and the noun that follows it (called the object of the preposition). In “The cat sat on the mat,” the prepositional phrase is “on the mat.” In “We arrived before noon,” the phrase is “before noon.” These phrases typically function as either adjectives or adverbs within the larger sentence, adding detail about where, when, or how something happened.
Conjunctions
A conjunction connects words, phrases, or clauses. The three main types serve different purposes.
Coordinating conjunctions join elements of equal grammatical weight. There are seven of them, remembered by the acronym FANBOYS: for, and, nor, but, or, yet, so. “I wanted coffee, but the shop was closed” connects two independent clauses.
Subordinating conjunctions attach a dependent clause to an independent one, showing a relationship like cause, time, or condition. Words like “because,” “although,” “if,” “when,” “since,” and “unless” fall here. “I stayed inside because it was raining” uses “because” to make the second clause depend on the first.
Correlative conjunctions work in pairs: “either…or,” “neither…nor,” “both…and,” “not only…but also.” They connect parallel elements: “She is both talented and hardworking.”
Interjections
An interjection is a word or short phrase that expresses emotion and stands apart from the grammatical structure of the sentence. Words like “wow,” “ouch,” “hey,” “oh,” and “yikes” are interjections. They’re usually followed by an exclamation point or a comma, depending on the intensity: “Wow! That was incredible” versus “Well, I suppose we could try.”
Interjections are the simplest part of speech because they don’t connect grammatically to the words around them. Remove one from a sentence and the sentence still works perfectly. They show up more in speech and informal writing than in formal or academic contexts.
How Words Shift Between Categories
One of the trickiest things about parts of speech is that a word’s category depends entirely on how it’s used in a specific sentence. The word “light” can be a noun (“turn on the light”), a verb (“light the candle”), or an adjective (“a light jacket”). “Well” can be an adverb (“she sings well”), an adjective (“I feel well”), a noun (“a water well”), or an interjection (“Well, that’s interesting”).
To identify a word’s part of speech, look at what job it’s doing in that particular sentence. Ask yourself: Is it naming something? Describing something? Showing action? Connecting ideas? The answer tells you the category. This is why memorizing a word’s part of speech in isolation doesn’t work. You need to see it in context. “I need to book a flight” uses “book” as a verb. “Hand me that book” uses it as a noun. Same word, different function, different part of speech.