Parts of Speech: The Building Blocks of English

Before a sentence can carry meaning, its words must each play a role: naming, doing, describing, linking. That role is called a part of speech.

A part of speech (also called a word class) is a group of words that do the same kind of job in a sentence. Traditional grammar teaches eight parts of speech: noun, pronoun, verb, adjective, adverb, preposition, conjunction and interjection. Some modern grammar books add a ninth class, the determiner, for words such as "a", "the", "this" and "my". The two systems do not really disagree. In the eight-class system, determiners are usually placed with the adjectives. This guide teaches the eight classes used in school courses and explains where determiners fit.

It covers every class in depth, shows how to test a word to find its class, explains why one word can have different jobs, and warns about common mistakes. It ends with worked examples, a glossary and ten practice questions.

1.The Big Idea: The Job Decides the Class

A word does not belong to a class by itself. Its job in the sentence decides the class. Many words can do more than one job, so memorising word lists is not enough. Instead, ask: "What is this word doing here?"

2.Nouns

A noun names a person, place, thing or idea. Nouns are the labels for everything we talk about, including things we cannot touch, such as "honesty" or "freedom".

Countable and uncountable nouns take different helper words. We say "many books" but "much water", and "fewer chairs" but "less water". We say "a book" but not "an information". To count an uncountable noun, use a unit: "a piece of advice", "a glass of water".

Plurals are usually made by adding -s or -es (book, books; box, boxes), but some are irregular: child, children; mouse, mice; sheep, sheep. Possessive nouns use an apostrophe: "the girl's bag", "the girls' bags". You can practise this in Punctuation Rules.

Collective nouns can take a singular or plural verb. British English often allows both ("The team is winning" or "The team are winning"), while American English more often uses the singular. This is a case where two reliable traditions differ, so be consistent within your own writing.

3.Pronouns

A pronoun takes the place of a noun so that we do not repeat it. "Maria picked up Maria's bag and Maria left" becomes "Maria picked up her bag and she left."

A pronoun must have a clear reference, meaning it must be clear which noun it replaces. "Ali told Hamza he was late" could mean either boy. Rewrite it: "Ali told Hamza, 'You are late.'" In modern English, "they" is also widely accepted as a singular pronoun, as in "Someone left their bag."

4.Verbs

A verb expresses an action, an event or a state. Every complete sentence needs at least one verb. It is the engine that makes the sentence work.

• Action verbs show what someone does: run, write, calculate.
• Linking verbs connect the subject to a description: be, seem, become, appear, feel. "The soup tastes salty." Here "tastes" links "soup" to "salty".
• Auxiliary (helping) verbs help another verb: be, have, do. "She has finished." "They are playing."
• Modal verbs show ability, possibility, permission or necessity: can, could, may, might, must, shall, should, will, would. They are followed by the base form of a verb: "She can swim."

Verbs can be transitive, which need an object ("She opened the door"), or intransitive, which do not ("She slept"). Many verbs can be both.

Most verbs have five forms. For "walk" they are walk, walks, walked, walked (the past participle) and walking. Regular verbs add -ed for the past. Irregular verbs change in other ways, such as go, went, gone. A group of verbs working together, such as "has been working", is a verb phrase. For all the tenses, see Tenses and Verb Forms.

5.Adjectives

An adjective describes or gives more information about a noun or pronoun. It can tell us about size, colour, quality, number or other features: "the tall, ancient castle".

Adjectives usually come before the noun ("a blue bag"), or after a linking verb ("The bag is blue"). Several adjectives in a row usually follow a natural order: opinion, size, age, shape, colour, origin, material, purpose. So we say "a beautiful old wooden table", not "a wooden old beautiful table".

Comparing: short adjectives add -er and -est (tall, taller, tallest). Longer adjectives use more and most (beautiful, more beautiful, most beautiful). Some are irregular: good, better, best; bad, worse, worst.

Where determiners fit. Words such as "a", "an", "the", "this", "my", "some" and "three" come before a noun to show which one or how many. Traditional school grammar treats them as adjectives (articles, demonstrative adjectives, possessive adjectives and numbers). Modern grammars call them determiners. Both approaches describe the same words.

6.Adverbs

An adverb modifies a verb, an adjective, another adverb, or a whole sentence. It usually tells us how, when, where, how often or to what extent.

Many adverbs end in -ly, but not all of them do, and not every -ly word is an adverb. "Fast", "hard" and "late" are adverbs that look like adjectives ("He runs fast"). "Friendly" and "lovely" are adjectives that end in -ly. So you cannot rely on the ending. Look at the job.

Take care with good and well. "Good" is an adjective ("a good singer"). "Well" is its adverb ("She sings well"). "Well" can also be an adjective meaning healthy ("I am well").

7.Prepositions

A preposition shows how a noun or pronoun relates to another word, usually in place, time or direction. A preposition is followed by a noun or pronoun, and together they make a prepositional phrase: "on the table", "after lunch", "through the door".

For time, we usually use at for clock times and points in time (at noon, at night), on for days and dates (on Friday, on 5 May) and in for longer periods (in July, in 2026, in the morning).

Some words are prepositions in one sentence and adverbs in another. "She climbed up the tree" has a preposition, because "up" has an object ("the tree"). "She looked up" has an adverb, because "up" has no object. Some adjectives and verbs also go with fixed prepositions: "good at", "interested in", "depend on", "different from".

8.Conjunctions

A conjunction joins words, phrases or clauses.

• Coordinating conjunctions join equal parts: for, and, nor, but, or, yet, so. Teachers often remember them as FANBOYS. "I was tired, but I kept working."
• Subordinating conjunctions join a dependent clause to a main clause: because, although, if, when, while, since, unless, after. "I stayed in because it was raining."
• Correlative conjunctions work in pairs: both ... and, either ... or, neither ... nor, not only ... but also.

A comma usually comes before a coordinating conjunction that joins two full clauses ("I was tired, but I kept working"). Words such as "however", "therefore" and "moreover" look like conjunctions but are adverbs. They cannot join two sentences with only a comma. Use a full stop or a semicolon before them: "I was tired; however, I kept working." You can see more in Sentence Structure.

9.Interjections

An interjection expresses sudden feeling, such as surprise, joy, pain or hesitation. It usually stands apart from the rest of the sentence, often followed by an exclamation mark or a comma: "Wow! That is incredible." "Well, I suppose that is true." Interjections are common in speech and informal writing, and they should be used sparingly in formal writing.

10.Same Word, Different Job

11.Quick Tests to Find a Word's Class

The prefixes and suffixes on a word are also a clue. For example, -tion often makes a noun, -ful an adjective, and -ly an adverb. See Prefixes, Suffixes and Root Words.

12.Worked Examples

13.Common Mistakes

• Adjective instead of adverb. "He runs quick" should be "He runs quickly". (But "fast" is correct in both roles.)
• Wrong pronoun form. "She gave the book to Hamza and I" should be "to Hamza and me". Test it by removing "Hamza and": you would say "gave the book to me".
• "Its" and "it's". "Its" is a possessive pronoun ("The dog wagged its tail"). "It's" means "it is" or "it has".
• Using "however" as a conjunction. "It was late, however I stayed" needs a semicolon or full stop before "however".
• Less and fewer. Use "fewer" with countable nouns ("fewer mistakes") and "less" with uncountable nouns ("less water") in formal writing.
• Unclear pronouns. If "he", "it" or "they" could mean two things, use the noun again.

14.Common Myths About Parts of Speech

15.How to Practise

• Colour-code. Take a short paragraph and use highlighters: one colour for each class.
• Use a dictionary. Entries show the class as a label, such as n. (noun), v. (verb), adj., adv., prep., conj. or pron. Notice that many words have more than one label.
• Change the job. Take a word such as "light" and write three sentences using it as a noun, a verb and an adjective.
• Expand a sentence. Start with "Dogs bark." Add an adjective, an adverb, a preposition phrase and a conjunction, and name each one you add.
• Use your own writing. Pick one paragraph from an old essay and label all the verbs. Check that each clause has one.

16.Key Terms

17.Why This Matters

Parts of speech are the foundation for everything else in grammar. You cannot fix a sentence structure problem, correct a punctuation error, or improve your style without first being able to say what job each word is doing. This is why Parts of Speech comes first in the Grammar Basics series, and why it leads on to Sentence Structure, Tenses and Verb Forms and Common Errors in English.